1. Department of Dermatology; Waterland Hospital; Purmerend The Netherlands
2. ZBC Multicare; Independent Treatment Centre for Dermatology; Hilversum The Netherlands
3. Department of Dermatology; Erasmus Medical Centre; Rotterdam The Netherlands
4. University of Wales Trinity St. David; Swansea; Wales United Kingdom
5. Department of Dermatology; Amsterdam Medical Centre; Amsterdam The Netherlands