1. Neurogenetics Lab, Born Bunge Foundation, Department of Biochemistry, University of Antwerp (UIA), B-2610 Antwerpen, Belgium.
2. Department of Neurology, University Hospital, 2300 RC Leiden, The Netherlands.
3. Department of Human Genetics, Sylvius Laboratorium, University of Leiden, 2333 AL Leiden, and Clinical Genetics Center, University Hospital Leiden, 2333 AA Leiden, The Netherlands.
4. Department of Biochemistry, St. Mary's Hospital Medical School, University of London, London W2 1PG, England.
5. Innogenetics Inc., 9710 Gent, Belgium,