[1] Univ Nottingham, CLAHRC NDL Nottinghamshire Derbyshire & Lincolnsh, Nottingham NG7 2GT, England
[2] Nottingham Univ Hosp NHS Trust, Nottingham, England
[3] Univ Glasgow, Div Cardiovasc & Med Sci, Glasgow, Lanark, Scotland
[4] Royal Prince Alfred Hosp, George Inst Int Hlth, Sydney, NSW, Australia
[5] Oslo Univ Hosp, Dept Phys Med & Rehabil, Ulleval, Norway
[6] Norwegian Univ Sci & Technol, Dept Neurosci, N-7034 Trondheim, Norway
[7] McGill Univ, Div Clin Epidemiol, Ctr Hlth, Montreal, PQ, Canada
[8] Ulster Hosp, Stroke Unit, Ulster, Ireland
[9] Newcastle Univ, Inst Ageing & Hlth, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England
[10] Akershus Univ Hosp, Dept Neurol, Akershus, Norway
[11] Karolinska Inst, Div Neurol, Dept Clin Neurosci, Stockholm, Sweden
[12] Kings Coll London, Div Hlth & Social Care, London WC2R 2LS, England