Physical activity of subjects aged 50-64 years involved in the European Prospective Investigation into Cancer and Nutrition (EPIC). by Haftenberger, M, Schuit, A, Tormo, M, Boeing, H, Wareham, N, Bueno-de-Mesquita, H, Kumle, M, Hjartåker, A, Chirlaque, MD, Ardanaz, E, Andren, C, Lindahl, B, Peeters, P, Allen, N, Overvad, K, Tjønneland, A, Clavel-Chapelon, F, Linseisen, J, Bergmann, M, Trichopoulou, A, Lagiou, P, Salvini, S, Panico, S, Riboli, E, Ferrari, P