id	keyword
bjos-8663587	saliva
bjos-8663587	covid-19
bjos-8663587	transmission
bjos-8663587	studies
bjos-8663587	doi
bjos-8663587	coronavirus
bjos-8663587	patients
bjos-8663587	review
bjos-8663587	human
bjos-8663587	droplets
bjos-8663587	study