Nader JLaboratorio de Patologia Vascular Cerebral, Instituto Nacional de Neurologia y Neurocirugia, "Manuel Velasco Suarez", Insurgentes Sur No.3877, México D.F. CP.14269, CH-1011, Lausanne, SwitzerlandService de Neurologie, Centre Hospitalier Universitaire Vaudois, CH-1011, Lausanne, Switzerland.