1. Department of Dermatology and Allergic Diseases; University Medical Center Ulm; Germany
2. Department of Dermatology and Dermatosurgery; Helios Clinic; Rottweil Germany
3. Department of Dermatology; University of Medicine and Pharmacy “Iuliu Hatieganu”; Cluj-Napoca Romania
4. Department of Otorhinolaryngology; Head and Neck Surgery; University Medical Center Ulm; Germany