1. From the John P. Robarts Research Institute, London, Ontario, Canada (G.G.F., M.E., J.W.F., H.J.M.B.); Department of Clinical Neurological Sciences, University of Western Ontario, London, Ontario, Canada (G.G.F., M.E., H.W.K.B., V.C.H., H.J.M.B.); Department of Epidemiology and Biostatistics, University of Western Ontario, London, Ontario, Canada (M.E.); Department of Surgery, University of Texas Southwestern Medical Center, Dallas (G.P.C.); Department of Surgery, University of Arkansas for Medical...