1. Department of Genetics, Center for Molecular MedicineUniversity Medical Center Utrecht, Utrecht University Utrecht The Netherlands
2. Division of Genetics and Genomic Medicine, Department of PediatricsWashington University School of Medicine St. Louis Missouri USA
3. Center for the Investigation of Membrane Excitability Diseases (CIMED) St. Louis Missouri USA
4. Deptartment of GeneticsUniversity Medical Center Groningen Groningen The Netherlands
5. Department of Human GeneticsKU Leuven Leuven Belgium
6. Department of Clinical Genetics, Amsterdam Medical CenterUniversity of Amsterdam Amsterdam The Netherlands
7. Department of Clinical Genetics, VU Medical CenterVU University Amsterdam Amsterdam The Netherlands