1. Department of Otorhinolaryngology, Head and Neck Surgery; University Medical Center of the Johannes Gutenberg University Mainz; Mainz; Germany
2. Institute of Medical Biostatistics, Epidemiology and Informatics (IMBEI); University Medical Center of the Johannes Gutenberg University Mainz; Mainz; Germany
3. Medical Clinic III; Friedrich-Alexander-University Erlangen-Nuremberg; Germany