Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  1 | 10 

ORIGINAL RESEARCH  

 

 

A study on risk perception, cognitive awareness and emotional responses to 

identify unmet training needs of frontline health care workers for  

COVID-19 containment in India 
 

 

Madhumita Dobe1, Monalisha Sahu1, Chandrashekhar Taklikar1, Shibani Dutta1 

 
 

 

1 All India Institute of Hygiene and Public Health, Kolkata, India. 

 

 

 

 

 

Corresponding author: Dr. Monalisha Sahu  

Address: 110, Chittaranjan Avenue, Kolkata – 700073, India; 

Telephone: +919873927966;  

E-mail: drmonalisha@outlook.com 

  

 

  

mailto:drvikaspsm@gmail.com


 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  2 | 10 

 

Abstract 

 

Aim: Frontline Health Care Workers (FLHCWs) are the key workforce in the fight against 

ongoing COVID-19 pandemic. They hail from the community and are responsible for 

supporting the health system in generating awareness, implementing preventive strategies, 

contact tracing and isolating potential cases. In their job responsibilities, FLHCWs thus may 

perceive heightened risk of exposure to the virus, leading to overwhelming emotional response 

and psychological distress. The objective of this study was to investigate risk perception, 

cognitive awareness and emotional responses among FLHCWs trained to deal with Covid 19, 

to identify unmet needs of this training in India. 

 

Methods: A cross-sectional study was conducted in a total of 131 frontline workers selected 

by a multistage sampling process from two states (Odisha and Himachal Pradesh) of India. The 

FLHCWs were interviewed personally (when feasible) with the help of a predesigned pretested 

semi-structured questionnaire. 

   

Results: The findings suggested that majority (90%) of the FLHCWs perceived that they are 

susceptible to nCoV-19 infection and 77.1% of FLHCWs felt high probability of them getting 

infected with the nCoV-19. Almost 90% of them responded that it is something they think 

about all the time and 41% of FLHCWs admitted that they feel helpless in the situation. About 

63% of FLHCWs perceived that the nCoV-19 infection was a severe illness and 35% perceived 

it to be very severe and life threatening. Although most of them had received some unstructured 

and non-uniform training on preventive measures against COVID-19, yet only 38% felt that 

the knowledge was adequate to protect themselves from the nCoV-19 infection. The training 

sessions lacked psychological component for capacitating them with coping skills to address 

their emotional and psychological responses. 

 

Conclusion: The FLHCWs experienced heightened risk perception and symptoms of 

emotional distress in significant numbers even after trainings. A more inclusive public health 

policy dialogue to address the emotional and psychological coping skills is needed for 

capacitation of these frontline workers to address the challenges of Pandemic response now 

and in future. 

  

Keywords: capacity building, Covid-19, emotional response, FLHCWs, pandemic, social 

support. 

 

Conflicts of interests: None declared. 

 

Acknowledgments: We would like to thank all participants to our study, whose time is even 

more precious in this difficult situation for all the country, who participated.  

 

 



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  3 | 10 

Introduction 

The novel coronavirus 2019 (nCoV-19) 

pandemic has caught the health systems 

off-guard and countries are struggling to 

control the galloping rates of transmission 

(1). The role of frontline health care 

workers (FLHCW) in generating awareness 

and promoting preventive methods to limit 

further transmission of nCoV-19 in the 

communities is critical.  

With 13,36,861 confirmed Cases and 

31,358 total deaths, India presently has the 

third highest number of confirmed nCoV-

19 cases and the eighth highest number of 

deaths due to nCoV-19 worldwide (2). The 

government of India has launched a 

massive operation to engage lakhs of 

FLHCWs in form of Accredited Social 

Health Activists (ASHAs) to contain the 

spread of nCoV-19 in the rural areas of 

different states of the country (3). They 

serve as an important link between 

community and the health facilities and are 

particularly indispensable to reach out to 

populations in remote and rural parts of 

India for dealing the nCoV-19 pandemic. 

The job responsibilities of FLHCWs 

fighting nCoV-19 in India involves (4): 

 Generating awareness in the 
community through Inter-personal 

communication about (a) Uptake of 

preventive and control measures 

including regular handwashing, 

practicing respiratory hygiene, 

maintaining social distance (b) 

Addressing myths and 

misconceptions;  

 Supporting Auxiliary Nurse 
Midwives (ANMs)/Supervisor in 

house-to-house active surveillance 

and contact tracing including (a) 

Identification of HRG, probable 

cases and their contacts; 

 Mobilizing community to ensure 
uptake of medical services in urban 

and rural areas; and  

 Reporting and providing feedback 
across different phases of nCoV-19 

pandemic (number of cases, 

imported/sporadic cases, clusters 

and community wide transmission).  

In their line of duties, many FLHCWs had 

to work for longer hours with Personal 
Protective Equipment (PPE) on and survey 

around 30 to 50 houses in a day depending on 

the risk levels of the area. 

Due to ‘Corona phobia’, they were often 

encountering stigma and physical violence 

during their home-to-home surveys (5). 

There is great fear regarding personal well-

being secondary to community 

transmission of the disease. This may result 

in overreaction, and plethora of other 

psychological manifestations like excessive 

worry, fear of infection and death and 

feeling of helplessness etc. Psychological 

preparedness of FLHCWs, their cognitive 

awareness and coping for emotional 

responses in these situations, have 

compelling relevance during this pandemic 

(6). 

Perspectives on emotional and 

psychological preparedness especially the 

needs of specific populations like FLHCWs 

while working for nCoV-19 are sparse.  

This study was conducted with the 

following objectives: 

 To assess the gaps in risk 
perceptions, cognitive awareness 

and capacity for coping with 

emotional responses in their job 

responsibilities during Covid 19 

pandemic; 

 To identify unmet needs for training 
and various challenges FLHCWs 

face while working in the 

community for COVID-19 

containment. 

 

Methods 

A cross-sectional study was carried out 

from April 2020–June 2020 at selected 15 

districts from the eastern state of Odisha 

and Northern city of Himachal Pradesh in 

India. A multistage sampling scheme was 

followed. The required sample size was 

calculated as 122 considering prevalence of 



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  4 | 10 

fear as 80% (as quoted from another study 

conducted in India by Parikh et al) at 10% 

error level and considering design effect as 

2. Adjusting for non-response additional 

10% sample size was added to 122 making 

the total sample size as 134. However, three 

of the responses were incomplete and were 

omitted and finally 131 responses were 

included in the study. 

In the first stage purposive selection of 

districts were done to select 13 districts 

from Odisha (Puri, Gajapati, Keonjhar, 

Kendrapara, Jagatsinghpur, Cuttack, 

Angul, Bhadrak, Balasore, Mayurbhanj, 

Sambalpur, Sundargarh, Sonepur) and 2 

districts from Himachal Pradesh (Mandi, 

Kangda). In the second stage fifteen health 

centers (14 PHC and 1 CHC) from each 

district were selected by using simple 

random selection technique. List of 

FLHCW was prepared working under these 

centers. In the third stage the sample of 131 

FLHCWs were randomly selected from the 

list and interviewed in person (when 

feasible) or over telephone, using a 

predesigned pretested semi-structured 

interview schedule consisting of 34 items. 

Written informed consent was taken prior 

to the interviews. Confidentiality and 

anonymity of the respondents was 

maintained throughout the study. Data was 

analysed using Microsoft Excel and SPSS 

Ver. 20. Appropriate statistical tests of 

significance were applied as necessary. The 

data were analysed using descriptive and 

inferential statistics. 

  

Results 
 

Sociodemographic profile of FLHCWs 

Nearly half (52%) of the FLHCWs were 

between the age group of 21-40 years old. 

Majority of them (70%) were educated up 

to matric or higher level. Most of them were 

trained for covid-19 (Table 1). 

 

Table 1. Distribution of the FLHCWs according to the socio- demographic profile  

and training status (N=131) 
 

Socio-demographic characteristics Number Percent  

Age (in yrs.)   

   21 – 30 07 5.34 

   31 – 40 61 46.56 

   41 – 50 58 44.28 

   51 – 60 05 3.82 

Educational Qualification   

   Primary 1 0.77 

   Upper Primary 39 29.78 

   Matric 56 42.74 

   Higher Secondary 22 16.79 

   Graduation 13 9.92 

  Training 

 

 

  

   Trained 125 95.5 

   Untrained 6 4.5 

 

Perception of risk: Majority (90%) of the 

FLHCWs felt that they are susceptible to 

nCoV-19 infection. 58% of them expressed 

that despite having knowledge about 

preventive measures it is difficult for them 

to avoid acquiring the infection. Most of the 



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  5 | 10 

FLHCWs (77.1%) felt that probability of 

them getting infected with the nCoV-19 is 

likely or extremely likely.  

Perception of severity: 63% of them 

feared that nCoV-19 infection causes 

severe illness and 35% perceived it to be 

very severe and life threatening.  

 

Table 2. Distribution of FLHCWs according to their knowledge and risk  

perception (N=131) 
 

Knowledge and risk perception  No. FLHCWs % 

Knowledge of protective measures against nCoV-19   

   Not at all 0 0.0 

   Inadequate/some 80 61.1 

   Adequate 51 38.9 

Perception regarding possibility of avoiding nCoV 

infection 

  

   Extremely difficult 3 2.3 

   Difficult 74 56.5 

   Easy 43 32.8 

   Extremely easy 11 8.4 

   Total 131 100 

Perception of Susceptibility to nCoV-19 infection   

   Not at all susceptible 14 10.7 

   Susceptible 67 51.1 

   Very susceptible 50 38.2 

Perception regarding possibility of getting 

themselves infected with the nCoV-19 

  

   Extremely unlikely 1 0.8 

   Unlikely 29 22.1 

   Likely 

 

83 63.4 

   Extremely likely 

 

18 13.7 

Perception about severity of nCoV-19 infection   

   Not Severe 2 1.5 

   Severe 84 63.1

6    Very Severe and life threatening 47 35.3

4 

 
 

Cognitive awareness regarding 

effectiveness of various preventive 

measures and the ease of practicing them 

[Figure 1]:  

Cognitive awareness is the most important 

part of decision making and practicing a 

particular behaviour. When asked about 

their perceptions regarding the protective 

measures against nCoV-19 infection, most 

of the FLHCWs (61.1%) reported that they 

have some knowledge about how to protect 

themselves from nCoV-19 but only 38% 



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  6 | 10 

believed that the knowledge was adequate 

to protect themselves from the nCoV-19 

infection.  

When asked to rank the preventive 

measures based on their effectivity, 

majority (74.8%) of the FLHCWs 

responded that washing hands frequently 

with soap and water was the most effective 

way to avoid infection followed by social 

distancing. Very few of them mentioned 

measures like staying at home, registering 

names in Govt. portals like ‘Arogya Setu’, 

using gloves and not spitting in public place 

as preventive measures that are important in 

preventing spread of nCoV-19. (Table 3). 

On applying chi-square test those who were 

educated up to higher secondary and above 

had significantly better knowledge of 

protective measures against nCoV-19 

(Chi=79.56 p<0.01). Their perception 

regarding possibility of getting themselves 

infected with the nCoV-19 was that chances 

of getting infected was low if preventive 

measures were practised properly 

(Chi=6.64 p<0.05). 

 

Figure 1. Distribution of ASHAs according to their cognitive awareness of preventive 

measures to limit spread of COVID-19 infection 

 
 

On questioning about their ease to practice 

preventive measures like washing hands 

and wearing masks, few (1.5%) of the 

FLHCWs said that wearing mask always 

was very inconvenient. 46% of them 

reported feeling uneasy and suffocated 

while wearing mask all the time. Some 

FLHCWs (22.1%) felt inconvenient to 

maintain social distancing while others 

(10%) found washing hands frequently 

with soap and water very inconvenient. 

 

Capacity for coping with emotional 

responses in Covid 19 pandemic work 

When asked about their emotional response 

to nCoV-19 infection, almost all of them 

(99%) answered that they feel worried 

about the possibility of acquiring nCoV-19  



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  7 | 10 

infection. 94% of them said that nCoV-19 

is causing a lot of fear amongst them. 90% 

of them also responded that it is something 

they think about all the time and 41% of 

FLHCWs admitted that they feel helpless 

because of nCoV-19. 22% of FLHCWs 

admitted that they search for information 

about nCoV-19 more than 10 times a day. 

Most of them (64% reported checking 

COVID related information more than 10 

times a day due to worry. 

42% of the respondents said that getting 

infected due to their job responsibilities, 

was a major concern to them; some others 

(5.3%) reported non availability of 

sufficient PPE kits as a major concern.  

However, 59% of FLHCWs felt that nCoV-

19 infection could be combatted through 

their own practices. 

 

Figure 2. Perceptions of FLHCWs about nCoV-19 infection and emotional response 

towards it (N=131) 

 

 

On probing about other challenges faced 

while doing active surveillance in the 

community, more than half of the FLHCWs 

reported that the stigma against the virus has 
also set off a chain of harassment against 

them, further demolishing their morale. 

Anxieties of their family members over their 

possibility of getting infected and 

transmitting it to others in the household also 

affected their attitude towards work. Some of 

them also reported feeling lonely and 

depressed when they stayed isolated at 

home due to the compulsion of maintaining 

physical distancing from their friends, 

relatives and family members. 

 

Identified unmet needs for training of 

FLHCWs for effectively addressing these 

gaps: 

For performing COVID-19 related work, 

almost 96.2% of the FLHCWs had received 

some training regarding COVID-19. 

However, most of them said that the 

training sessions were unstructured and not 

uniform. Also, the training session lacked 

psychological component for capacitating 

them with coping skills to address the 

psychological responses. 

 

Discussion 

In a similar study for Risk perception 

assessment of COVID-19 among 

Portuguese Healthcare Professionals 

(HCPs) it was found that 54.9% of HCPs 

believed there was a high probability of 

becoming infected. Regarding the 

likelihood of family and friends becoming 

infected, about 60% of them felt there was 



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  8 | 10 

a “moderate” probability. Regarding the 

perceived effectiveness of the quarantine 

measures, more than 70% believing it to be 

“very effective”. Most participants (60.0%) 

had the opinion that communication from 

the Health Authorities was “moderately 

adequate”. When asked about health 

services' preparations to manage this 

pandemic, 63.5% of the HCPs responded to 

be “poorly prepared” (7). 

In another study conducted in Italy it was 

found that health workers reported higher 

risk perception, level of worry, and 

knowledge as related to COVID-19 

infection compared to general population. 

Psychological state, gender, and living area 

were found to be important predictors of 

these factors. Instead, judgments about 

behaviours and containment rules were 

more linked to demographics, such as 

gender and alcohol consumption (8). 

In a questionnaire-based on-line survey 

taken by a total of 744 healthcare personnel 

(mostly Indian) about 80% of the healthcare 

professionals were worried about being 

infected. Almost 98% of healthcare 

professional, identified ‘Difficulty in 

breathing” as the main symptom and more 

than 90% of the respondents knew and 

practiced different precautionary measures. 

A minority of the respondents (28.9%) 

knew that there was no known cure yet. 

Almost all respondents from both the 

groups agreed on seeking medical help if 

breathing difficulty is involved and self-

quarantine if required (9). 

In another cross-sectional, web-based study 

conducted among 529 HCWs in Iran, it was 

seen that a significant proportion of HCWs 

had poor knowledge of its transmission 

(61%) and symptom onset (63.6%) but 

showed positive perceptions of COVID-19 

prevention and control. Factors such as age 

and profession were associated with 

inadequate knowledge and poor perception 

of COVID-19 (10). 

A cross-sectional study was performed 

between January 2020 and February 2020 

at District Hospital, Ho Chi Minh City in 

327 healthcare workers showed good 

knowledge with approximately two thirds 

of the participants well aware about the 

mode of transmission, isolation period and 

modalities of treatment and held positive 

attitude regarding the risk of personal and 

family members getting illness. There was 

a negative correlation between knowledge 

scores and attitude scores (r=-0.21, 

P<0.001) (11).  

An online cross-sectional study undertaken 

in a Teaching Hospitals (MUTHs) in 

Uganda through WhatsApp Messenger 

among HCWs reported that HCWs had 

sufficient knowledge, 21% (n = 29) had 

positive attitude, and 74% (n = 101) were 

following good practices toward COVID-

19. Factors associated with good practices 

were age 40 years or more (aOR: 48.4; 95% 

CI: 3.1–742.9; p = 0.005) and holding a 

diploma (aOR: 18.4; 95% CI: 1–322.9; p = 

0.046) (12). 

Findings from an online survey-based study 

conducted among healthcare professionals 

in Pakistan showed HCPs have good 

knowledge (93.2%, n=386), positive 

attitude and good practice regarding 

COVID-19. HCPs perceived that limited 

infection control material and poor 

knowledge regarding transmission of 

COVID-19 are the major barriers in 

infection control practice. Factors such as 

age, experience and job were significantly 

associated with good knowledge and 

practice.  

 

Conclusion 

Risk perception and fear of vulnerability to 

Covid 19 was high among the FLHCWs 

leading to a greater chance of FLHCWs 

being unwilling to participate actively in 

the programs for response to pandemics in 

future. FLHCWs need to be better trained 

with substantial emphasis on emotional and 

mental wellbeing and should be provided 

with all the essential commodities 

particularly sufficient personal protective 

equipment, to conduct active surveillance 

safely. Emphasis is needed during training 



 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  9 | 10 

to build capacity emotional and 

psychological coping skills for reducing 

emotional and psychological distress of 

FLHCWs deployed for work during 

pandemics. The community also need to be 

better informed and motivated to avoid 

stigmatization and harassment of the 

FLHCWs.  

 

References 

1. World Health Organization. 
Coronavirus Disease 2019 

(COVID-19) Situation Report – 98. 

WHO; 2020. Available from: 

https://www.who.int/docs/default-

source/coronaviruse/situation-

reports/20200427-sitrep-98-covid-

19.pdf?sfvrsn=90323472 

(accessed: April 28, 2020).   

2. World Health Organization. Novel 
Coronavirus Disease 2019 

(COVID-19) Situation Update 

Report – 26. WHO; 2020. 

Available from: 

https://www.who.int/docs/default-

source/wrindia/situation-

report/india-situation-report-

26.pdf?sfvrsn=a292c9c5_2 

(accessed: April 28, 2020). 

3. Ministry of Health and Family 
Welfare. COVID 19-India. 

Available from: 

https://www.mohfw.gov.in/ 

(accessed: April 28, 2020). 

4. Ministry of Health and Family 
Welfare. COVID-19 BOOK OF 

FIVE Response and Containment 

Measures for ANM, ASHA, 

AWW. Available 

from: https://www.mohfw.gov.in/p

df/3Pocketbookof5_Covid19_27M

arch.pdf (accessed: April 28, 

2020).  

5. Direct Relief. The Million Women 
Working on India’s Covid-19 

Frontlines. Available from: 

https://www.directrelief.org/2020/0

5/the-million-women-working-on-

indias-covid-19-frontlines/ 

(accessed: April 28, 2020).  

6. Aven T, Bouder F. The COVID-19 
pandemic: how can risk science 

help?. J Risk Res 2020;23:849-54. 

7. Peres D, Monteiro J, Almeida MA, 
Ladeira R. Risk perception of 

COVID-19 among Portuguese 

healthcare professionals and the 

general population. J Hospi Infect 

2020;105:434-7.  

8. Simione L, Gnagnarella C. 
Differences between health 

workers and general population in 

risk perception, behaviors, and 

psychological distress related to 

COVID-19 spread in Italy. Front 

Psychol 2020;11:2166. 

9. Parikh PA, Shah BV, Phatak AG, 
Vadnerkar AC, Uttekar S, Thacker 

N, et al. COVID-19 pandemic: 

knowledge and perceptions of the 

public and healthcare 

professionals. Cureus 2020;12. 

10. Bhagavathula AS, Aldhaleei WA, 
Rahmani J, Mahabadi MA, Bandari 

DK. Knowledge and perceptions of 

COVID-19 among health care 

workers: cross-sectional study. 

JMIR Public Health Surveill 

2020;6:e19160. 

11. Giao H, Thi N, Han N, Khanh TV, 
Ngan VK, Tam V. Knowledge and 

attitude toward COVID-19 among 

healthcare workers at Knowledge 

and attitude toward COVID-19 

among healthcare workers at 

District 2 Hospital, Ho Chi Minh 

City. Asian Pac J Trop Med 

2020;13:260-5. 

12. Olum R, Chekwech G, Wekha G, 
Nassozi DR, Bongomin F. 

Coronavirus disease-2019: 

knowledge, attitude, and practices 

of health care workers at Makerere 

University Teaching Hospitals, 

Uganda. Front Public Health 

2020;8:181.  

https://www.who.int/docs/default-source/wrindia/situation-report/india-situation-report-26.pdf?sfvrsn=a292c9c5_2
https://www.who.int/docs/default-source/wrindia/situation-report/india-situation-report-26.pdf?sfvrsn=a292c9c5_2
https://www.who.int/docs/default-source/wrindia/situation-report/india-situation-report-26.pdf?sfvrsn=a292c9c5_2
https://www.who.int/docs/default-source/wrindia/situation-report/india-situation-report-26.pdf?sfvrsn=a292c9c5_2


 

Dobe M, Sahu M, Taklikar C, Dutta S. A Study on risk perception, cognitive awareness and 

emotional responses to identify unmet training needs of frontline Health Care Workers (FLHCWs) 

for COVID-19 containment In India (Original research). SEEJPH 2022, posted: 29 October 

2022. DOI: 10.11576/seejph-5976 
 

P a g e  10 | 10 

13. Saqlain M, Munir MM, Rehman 
SU, Gulzar A, Naz S, Ahmed Z, et 

al. Knowledge, Attitude and 

Practice among Healthcare 

Professionals regarding COVID-

19: A cross-sectional survey from 

Pakistan. J Hosp Infect 2020. 

Available from: 

https://www.medrxiv.org/content/1

0.1101/2020.04.13.20063198v1.ful

l.pdf

14.  (accessed: April 28, 2020). 
__________________________________________________________________________________________ 

 

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