1. Department of Plastic, Reconstructive and Hand Surgery Amsterdam University Medical Centers University of Amsterdam Amsterdam the Netherlands
2. Department of Otolaryngology Vascular Birthmark Institute of New York Lenox Hill and Manhattan Eye, Ear, and Throat Hospitals New York NY U.S.A.
3. Department of Dermatology Radboud University Medical Center Nijmegen the Netherlands
4. Department of Epidemiology and Biostatistics and Amsterdam Public Health Research Institute Amsterdam University Medical Centers Vrije Universiteit Amsterdam Amsterdam the Netherlands
5. Department of Dermatology Amsterdam University Medical Centers University of Amsterdam Amsterdam Public Health, Infection and Immunity Amsterdam the Netherlands