1. Department of Surgical Sciences, Otorhinolaryngology, Head and Neck Surgery, Uppsala University, Uppsala, Sweden
2. Sleep Disorders Centre, Pulmonary Department, Sahlgrenska University Hospital, Gothenburg, Sweden
3. Centre for Sleep and Wake Disorders, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
4. Department of Medical Sciences, Respiratory, Allergy and Sleep Research, Uppsala University, Uppsala, Sweden
5. Lund University, Faculty of Medicine, Department of Clinical Sciences Lund, Respiratory Medicine and Allergology, Lund, Sweden
6. Centre for Research and Development, Region of Gävleborg/Uppsala University, Gävle Hospital, Gävle, Sweden