[1] Univ Bonn, FE Klin Funkt Neurobildgebung, Radiol Univ Klin, D-53127 Bonn, Germany
[2] Tech Univ Munich, Klinikum Rechts Isar, Nukl Med Klin, D-8000 Munich, Germany
[3] Tech Univ Munich, Klinikum Rechts Isar, Neurol Klin, D-8000 Munich, Germany
[4] Univ London Imperial Coll Sci Technol & Med, Dept Med, MRC Clin Sci Ctr, London, England
[5] Neurol Krankenhaus Munchen, Munich, Germany
[6] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[7] Tech Univ Munich, Klinikum Rechts Isar, Klin Anaesthesiol, D-8000 Munich, Germany