1 Department of Dermatology, Venereology and Allergology, International Centre for Hidradenitis Suppurativa/Acne Inversa (ICH), Ruhr-University Bochum, Bochum, Germany.
2 Skin Cancer Center, Department of Dermatology, Venereology and Allergology, Ruhr-University Bochum, Bochum, Germany.