From the Department of Neurology, Hospital Santa Maria, Lisboa, Portugal (J.M.F., P.C.); Department of Neurology, Academic Medical Centre Amsterdam, Amsterdam, Netherlands (J.S.); Department of Neurology, Hôpital Lariboisière Paris, Paris, France (M-G.B.); and Department of Neurology, Instituto Nacional de Neurologia y Neurocirurgia, México City, México (F.B.). (At 2004-03)