Effectiveness of a Web-based physical activity intervention in patients with knee and/or hip osteoarthritis: randomized controlled trial.

Bossen, D., Veenhof, C., Beek, K.E.C. van, Spreeuwenberg, P.M.M., Dekker, J., Bakker, D.H. de. Effectiveness of a Web-based physical activity intervention in patients with knee and/or hip osteoarthritis: randomized controlled trial. Journal of Medical Internet Research: 2013, 15(11), e257