1. Department of Dermatology Maastricht University Medical Centre+ Maastricht The Netherlands
2. Department of Dermatology Haga Hospital The Hague The Netherlands
3. Department of Pathology Maastricht University Medical Centre + Maastricht The Netherlands
4. Department of Dermatology Newcastle University Newcastle UK
5. Department of Dermatology Northampton General Hospital Northampton UK
6. Department of Clinical Genetics Maastricht University Medical Centre + Maastricht The Netherlands