Developing a policy brief on physical activity promotion for children and adolescents - Messing, Sven; Gelius, Peter; Abu-Omar, Karim; Marzi, Isabel; Beck, Franziska; Geidl, Wolfgang; Grüne, Eva; Tcymbal, Antonina; Reimers, Anne Kerstin; Pfeifer, Klaus (Friedrich-Alexander-Universität Erlangen-Nürnberg, 2023)