1. VU University Medical Center; Community Genetics Section, Clinical Genetics; BS7, D420 PO Box 7057 1007 MB Amsterdam Netherlands
2. Academic Medical Center; Dutch Cochrane Centre; Room J1B - 211 P.O. Box 22700 Amsterdam Netherlands 1100 DE
3. Leiden University Medical Center; Department of Neurology; PO Box 9600 Leiden Netherlands 2300 RC