1. International Centre for Hidradenitis suppurativa/Acne inversa (ICH), Department of Dermatology, Venereology and Allergology, Ruhr-University, Bochum, Germany
2. Skin Cancer Centre, Department of Dermatology, Venereology and Allergology, Ruhr-University Bochum, Bochum, Germany
3. Department of Dermatology and Phlebology, Christian Hospital Unna, Unna, Germany
4. Department of Dermatology, Dortmund Hospital gGmbH and Faculty of Health, Witten/Herdecke University, Dortmund, Germany