[1] Univ Bonn, Inst Human Genet, D-5300 Bonn, Germany
[2] Univ Hamburg, Ctr Mol Neurobiol, D-2000 Hamburg, Germany
[3] Univ Wurzburg, Dept Neurol, D-8700 Wurzburg, Germany
[4] Univ Tromso, Dept Neurol, Tromso, Norway
[5] Univ Berlin, Gene Mapping Ctr, Berlin, Germany
[6] Univ Bonn, IMBIE, D-5300 Bonn, Germany
[7] Ruhr Univ Bochum, Dept Neurol, D-4630 Bochum, Germany
[8] Ruhr Univ Bochum, Dept Pediat, D-4630 Bochum, Germany