1. Department of Clinical GeneticsErasmus Medical Centre Rotterdam the Netherlands
2. Department of Human GeneticsRadboud University Medical Centre Nijmegen the Netherlands
3. Department of GeneticsUniversity Medical Centre Groningen Groningen the Netherlands
4. Department of GeneticsGuy's and St Thomas' Hospital London UK
5. Department of Clinical Genetics, Centre for Connective Tissue ResearchVU University Medical Centre Amsterdam the Netherlands
6. Department of DermatologyRadboud University Medical Centre Nijmegen the Netherlands
7. Centre for Medical GeneticsUniversity Hospital of Antwerp/University of Antwerp Antwerp Belgium
8. Department of NeurologyRadboud University Medical Centre Nijmegen the Netherlands