1. Department of Epidemiology and Biostatistics, Michigan State University, East Lansing, MI (M.P.T., Z.L., J.G., M.J.R.).
2. Department of Cardiac Surgery, University of Michigan Medical School, Ann Arbor, MI (M.P.T.)
3. Department of Neurology, University of Michigan Medical School, Ann Arbor, MI (J.F.B.)