[1] Univ Calif Los Angeles, Dept Neurol, Reed Neurol Res Ctr, Los Angeles, CA 90024 USA
[2] Univ Milan, Milan, Italy
[3] Columbia Univ, Neurol Inst, New York, NY USA
[4] Univ Copenhagen, Gentofte Hosp, Copenhagen, Denmark
[5] Catholic Univ Louvain, B-1200 Brussels, Belgium
[6] Otto Von Guericke Univ, Magdeburg, Germany
[7] Kyoto Univ, Kyoto 606, Japan
[8] Hosp I Albert Einstein, Sao Paulo, Brazil
[9] Inst Neurophysiol, Vienna, Austria