1 Department of Otorhinolaryngology, Gyeongsang National University College of Medicine and Gyeongsang National University Hospital, Jinju, Republic of Korea.
2 Institute of Health Sciences, Gyeongsang National University, Jinju, Republic of Korea.
3 Division of Sleep and Circadian Disorders, Departments of Medicine and Neurology, Brigham & Women's Hospital & Harvard Medical School, Boston, Massachusetts, USA.