Toschke André M, Heuschmann Peter U, Wood Oliver, Wolfe Charles D A
Division of Health and Social Care, Department of Public Health Sciences, King's College London, 42 Weston St, 7th Floor, Capital House, London SE1 3QD, UK.
Age Ageing. 2009 Jan;38(1):100-3. doi: 10.1093/ageing/afn232. Epub 2008 Nov 21.