1. Department of Dermatology University Hospital Basel Basel Switzerland
2. Department of Dermatology, Dermatopathology Training Center University Hospital Basel Basel Switzerland
3. Institute of Medical Genetics and Pathology University Hospital Basel Basel Switzerland
4. Department of Dermatology Philipps‐University of Marburg Marburg Germany
5. Department of Dermatology Medical Center‐University of Freiburg Freiburg Germany