1. From the Research Bureau (B.J.K.), Isala Academy, Isala klinieken, Zwolle, The Netherlands; the Health and Rehabilitation Sciences Research Institute (S.L., B.L.), University of Ulster, Newtownabbey, Northern Ireland; Royal Victoria Hospital (B.L.), Belfast, Northern Ireland; the Regional Acquired Brain Injury Unit (L.W.-S.), Belfast, Northern Ireland; the Faculty of Human Movement Science (M.S., G.K.), VU University, Amsterdam, The Netherlands; Roessingh Research and Development (J.H.B.), Enschede,...