1. Section of Phoniatrics, Pedaudiology and Neurootology, Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Mannheim, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
2. Faculty of Therapeutic Sciences, SRH University Heidelberg, Heidelberg, Germany
3. Outpatient clinic for pneumology and sleep medicine, Heppenheim, Germany
4. Center of Dentistry, Lampertheim, Germany
5. Department of Otorhinolaryngology, Universitätsklinik Magdeburg, Magdeburg, Germany
6. Center of Otorhinolaryngology Traunstein, Traunstein, Germany