Physical activity and screen time of children and adolescents before and during the COVID-19 lockdown in Germany: a natural experiment

por Steffen C. E. Schmidt, Bastian Anedda, Alexander Burchartz, Ana Eichsteller, Simon Kolb, Carina Nigg, Claudia Niessner, Doris Oriwol, Annette Worth, Alexander Woll
Publicado 2020