1. Department of Dermatology; University Medical Center Freiburg; Hauptstr. 7 79104 Freiburg Germany
2. Catholic University of Applied Sciences; Freiburg Germany
3. Department of Dermatology; University of Heidelberg; Heidelberg Germany
4. Center for Human Genetics Freiburg; Freiburg Germany
5. Klinikum Dritter Orden; Paediatric Clinic; Munich Germany
6. Department of Paediatric Dermatology and Allergology; Catholic Children's Hospital Wilhelmstift; Hamburg Germany
7. Pediatrics and Oncology Center; Chorzów Poland
8. Department of Genetics and Molecular Biology; Medical University of Silesia; Katowice Poland
9. Department of Dermatology; Agia Sofia Children's Hospital; Athens Greece