title: EURAPA moves to open access: Research trends and challenges in physical activity in old age.
authors: The European Group for Research into Elderly and Physical Activity, Wingate College, Wingate Institute, Netanya, 4290200 Israel.
authors: Yael
authors: Y
authors: Netz
authors: Institute of Movement and Sport Gerontology, German Sport University, Cologne, 50933 Germany.
authors: Wiebren
authors: W
authors: Zijlstra