1. Department of Otorhinolaryngology-Head and Neck Surgery, Korea University College of Medicine, Seoul, Korea.
2. Department of Sleep Medicine, Shiga University of Medical Science, Shiga, Japan.
3. Department of Dentistry, Korea University College of Medicine, Seoul, Korea.
4. Institute of Human Genomic Study, Korea University College of Medicine, Seoul, Korea.
5. Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.