1 Department of Dermatology, Erasmus MC, University Medical Center, Rotterdam.
2 Department of Dermatology, Center of Pediatric Dermatology, Sophia Children's Hospital, Erasmus MC University Medical Center Rotterdam-Sophia Children's Hospital, Rotterdam.
3 Department of Dermatology, Sint Antonius Hospital, Nieuwegein.
4 Department of Dermatology and Allergology, Wilhelmina Children's Hospital, University Medical Center Utrecht.
5 Department of Dermatology, Amsterdam University Medical Centers, Amsterdam.
6 Department of Dermatology, University Medical Center Groningen, University of Groningen, Groningen, the Netherlands.