1. From the Clinical Practice Research Unit (C.L.W., M.F.A., C.F.D., C.E.L., C.J.S., M.J.L.), University of Central Lancashire, Preston, UK; Royal Liverpool and Broadgreen University Hospitals NHS Trust (H.A.D.), Liverpool, UK; The Royal Group of Hospitals and Dental Hospital Health and Social Services Trust (C.I.A.J.), Belfast, UK; and Wolfson Neurorehabilitation Centre and St George’s Hospital (M.D.v.d.B.), Wimbledon, London, UK.