1. From the Center for Stroke Research, Department of Neurology, Henry Ford Hospital and Health Sciences Center, Detroit, Mich (D.T., S.R.L.) and the Midwest Hemostasis and Thrombosis Laboratories, Ball Memorial Hospital, Muncie, Ind (D.A.T.). Dr Tanne is currently at the Department of Neurology, Chaim Sheba Medical Center, Tel Hashomer, Israel.