The Alberta moving beyond breast cancer (AMBER) cohort study: a prospective study of physical activity and health-related fitness in breast cancer survivors oleh Courneya Kerry S, Vallance Jeff K, Culos-Reed S, McNeely Margaret L, Bell Gordon J, Mackey John R, Yasui Yutaka, Yuan Yan, Matthews Charles E, Lau David CW, Cook Diane, Friedenreich Christine M