1. Department of Otolaryngology - Head and Neck Surgery, Technical University of Munich, Munich, Germany;
2. Department of Otolaryngology - Head and Neck Surgery, University Hospital Freiburg, Freiburg, Germany;
3. Institute of Medical Statistics and Epidemiology, Technical University of Munich, Munich, Germany;
4. Department of Anesthesia, Technical University of Munich, Munich, Germany;
5. Adelaide Institute for Sleep Health, A Flinders Centre of Research Excellence, College of Medicine and Public Health, Flinders University, Bedford Park, South Australia, Australia