id	keyword
agb-209	covid-19
agb-209	pandemic
agb-209	urbanization
agb-209	study
agb-209	doi
agb-209	cities
agb-209	population
agb-209	factors
agb-209	health
agb-209	china
agb-209	spread
agb-209	variables
agb-209	et al
agb-209	density