[1] Oregon Hlth & Sci Univ, Dept Neurol, Portland, OR 97201 USA
[2] Univ Lubeck, Dept Neurol, Lubeck, Germany
[3] Univ Lubeck, Dept Human Genet, Lubeck, Germany
[4] Univ Belgrade, Fac Biol, Belgrade, Yugoslavia
[5] Gen Reg Hosp Bolzano, Dept Neurol, Bolzano, Italy
[6] Albert Einstein Coll Med, Dept Human Genet, New York, NY USA