1. From the Centre for Clinical Neuroscience (U.K., H.S.M.), St George’s University of London, the Department of Clinical Biochemistry (C.C., P.C.), St. George’s Healthcare NHS Trust, the Department of Stroke Medicine (L.K.), King’s College London School of Medicine, Guy’s and St Thomas’ NHS Trust (A.R.), London, and the Department of Public Health Sciences (C.D.A.W.), Division of Health and Social Care Research, King’s College London, UK.