1. Department of General Surgery; Sana Clinics Eastern Holstein; Clinic Eutin; Germany
2. Department of Dermatology; University Clinic of Schleswig-Holstein; Lübeck; Germany
3. Department of Otorhinolaryngology and Plastic Surgery; University Clinic of Schleswig-Holstein; Lübeck; Germany
4. Department of Otorhinolaryngology; Amper Clinics; Dachau; Germany