Thema
Adolescent
1
Adult
1
Age Factors
1
Aged
1
Aged, 80 and over
1
COVID-19
1
Child
1
Child, Preschool
1
China
1
Coronavirus Infections
1
Cross-Sectional Studies
1
France
1
Germany
1
Humans
1
Infant
1
Infant, Newborn
1
Italy
1
Middle Aged
Netherlands
1
Pandemics
1
Pneumonia, Viral
1
Republic of Korea
1
Risk Factors
1
Spain
1
Switzerland
1
United States
1
Young Adult
1