Birns Jonathan, Vilasuso Maria, Cohen David L
Department of Stroke Medicine, Guy's, King's and St Thomas's School of Medicine, Denmark Hill Campus, Bessemer Road, London, SE5 9PJ, UK.
Age Ageing. 2006 May;35(3):306-8. doi: 10.1093/ageing/afj057. Epub 2006 Feb 23.