1. Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Ruprecht-Karls-University of Heidelberg, Universitätsmedizin Mannheim (UMM), Mannheim, Germany
2. Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Facial Plastic Surgery, Klinikum Karlsruhe, Karlsruhe, Germany