1. Department of Otolaryngology and Department of Sleep Medicine, Cleveland Clinic Foundation, Cleveland, Ohio
2. Department of Otolaryngology, University Clinic Schleswig-Holstein, Lubeck, Germany
3. Department of Otolaryngology, Technical University of Munich, Munich, Germany
4. Department of Otolaryngology, University of Alabama, Birmingham, Alabama
5. Department of Otolaryngology and Department of Sleep Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania
6. Department of Otolaryngology and Department of Pulmonary, Allergy, and Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
7. Department of Otolaryngology and Department of Neurology, University of Kansas Health System, Kansas City, Kansas
8. Department of Otolaryngology, University Clinic Mannheim, Mannheim, Germany; and
9. Division of Otolaryngology and Sleep Medicine, University of Pennsylvania, Philadelphia, Pennsylvania