1. Department of ENT, Head and Neck Surgery, Antwerp University Hospital, Edegem, Antwerp, Belgium
2. Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
3. Department of Otorhinolaryngology, Head & Neck Surgery, Sleep Disorders Center, University Hospital Mannheim, Mannheim, Germany
4. ENT Department, Facial Plastic and Interventional Sleep Medicine, Kliniken St. Antonius, Wuppertal, Germany
5. Department of Otolaryngology-Head and Neck Surgery, Wayne State University School of Medicine, Detroit, MI
6. Department of Surgery, John D. Dingell VA Medical Center, Detroit, MI
7. Department of ENT, Head and Neck Surgery, Saint Lucas Andreas Hospital, Amsterdam, Netherlands