A community-based physical activity intervention to prevent mobility-related disability for retired older people (REtirement in ACTion (REACT)): study protocol for a randomised con... oleh Afroditi Stathi, Janet Withall, Colin J. Greaves, Janice L. Thompson, Gordon Taylor, Antonieta Medina-Lara, Colin Green, James Bilzon, Selena Gray, Heidi Johansen-Berg, Claire E. Sexton, Max J. Western, Jolanthe L. de Koning, Jessica C. Bollen, Sarah J. Moorlock, Naiara Demnitz, Poppy Seager, Jack M. Guralnik, W. Jack Rejeski, Ken R. Fox