Show 10 5 10 15 20 50 100 250 Sort by year (new to old) Actions Download search results Subscribe to news feed Your filters: cql: author="Siefken, Katja" or (type any "bookEditor issueEditor" and editor="Siefken, Katja") Add to list Journal Article A1 open access Status and trends of physical activity surveillance, policy, and research in 164 countries : findings from the Global Observatory for Physical Activity - GoPA! 2015 and 2020 surveys Andrea Ramírez Varela, Pedro C. Hallal, Juliana Mejía Grueso, Željko Pedišić, Deborah Salvo, Anita Nguyen, Bojana Klepac, Adrian Bauman, Katja Siefken, Erica Hinckson, et al. (2023) JOURNAL OF PHYSICAL ACTIVITY & HEALTH. 20(2). p.112-128