Middelweerd, AMollee, JKlein, MMManzoor, ABrug, Jte Velde, SJ2025-03-272025-03-2720203196133010.2196/12538https://rivm.openrepository.com/handle/10029/652896The use and effects of an App-based physical activity intervention Active2Gether" in young adults: Quasi-Experimental Trial."ArticleJMIR Form Res 2020; 4(1):e125382025-03-27