1. Excellence Center for Sleep Disorders, King Chulalongkorn Memorial Hospital/Thai Red Cross Society, Bangkok, Thailand
2. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
3. Department of Otolaryngology and Ophthalmology, Naresuan University, Phitsanulok, Thailand
4. Department of Otolaryngology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
5. Department of Otorhinolaryngology, Hospital Raja Permaisuri Bainun, Ipoh, Perak, Malaysia
6. Department of Pediatrics, Division of Pediatric Neurology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
7. Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand