1. From the Department of Rehabilitation Medicine (G.K., J.M.V., E.v.W.), Research Institute MOVE, VU University Medical Center, Amsterdam, The Netherlands; the Department of Rehabilitation Medicine (G.K.), Rudolf Magnus Institute of Neuroscience, University Medical Centre Utrecht, Utrecht, The Netherlands; the Department of Rehabilitation Medicine and Physical Therapy (B.C.H.v.d.W.), Erasmus MC, University Medical Centre, Rotterdam, The Netherlands; and the Department of General Practice (B.J.K.),...