Stratified exercise therapy does not improve outcomes compared with usual exercise therapy in people with knee osteoarthritis (OCTOPuS study): a cluster randomised trial.
J. Knoop; J Dekker; J.M. van Dongen; M van der Leeden; M. de Rooij; W.F. Peter; W. de Joode; L. van Bodegom-Vos; N. Lopuhaä; K.L. Bennell; W.F. Lems; M. van der Esch; T.P. Vliet Vlieland; R.W.J.G. Ostelo