Effectiveness of tailored exercise therapy in patients with knee osteoarthritis and comorbidity: a randomized controlled trial. (April 2016) - de Rooij, M.; van der Leeden, M.; Cheung, J.; van der Esch, M.; Häkkinen, A.; Haverkamp, D.; Roorda, L.D.; Twisk, J.; Vollebregt, J.; Lems, W.F.; Dekker, J.