1. From the Hemorrhagic Stroke Research Program (S.M.G., R.N.K.N., P.D., J.R., A.V., E.E.S.), Department of Neurology, and the C.S. Kubik Laboratory in Neuropathology (M.P.F.), Massachusetts General Hospital and Harvard Medical School, Boston, Mass; and the Department of Biostatistics (R.A.B.), Harvard School of Public Health, Boston, Mass.