1. Department of Dermatology; University Medical Center Regensburg; Franz-Josef-Strauss-Allee 11 93053 Regensburg Germany
2. Department of Otorhinolaryngology; University Medical Center Regensburg; Franz-Josef-Strauss-Allee 11 93053 Regensburg Germany
3. Institute of Human Genetics; University Hospital of Cologne; Cologne Germany