1. Department of Epidemiology and Biostatistics, College of Human Medicine, Michigan State University, East Lansing (M.J.R.).
2. Menzies Institute for Medical Research, University of Tasmania, Hobart, Australia (S.L.G.).
3. Peritz Scheinberg Cerebral Vascular Disease Research Laboratory, Department of Neurology, Leonard M. Miller School of Medicine, University of Miami, FL (A.P.R.).