1. From the Rehabilitation & Ageing Studies Unit (C.A., S.R., M.C.), Department of Medicine, Flinders University of South Australia, Daw Park, South Australia; Clinical Trials Research Unit (C.A., C.N.M.), Department of Medicine, University of Auckland, Auckland, New Zealand; and Southern Domiciliary Care & Rehabilitation Service (C.S., A.W.), Adelaide, South Australia.