1. Department of Psychiatry, Ewha Womans University College of Medicine, Ewha Womans University Seoul Hospital , Seoul , Republic of Korea
2. Division of Child and Adolescent Psychiatry, Department of Psychiatry, Seoul National University Hospital , Seoul , Republic of Korea
3. Department of Psychiatry and Center for Sleep and Chronobiology, Seoul National University College of Medicine, Seoul National University Hospital , Seoul , Republic of Korea
4. Department of Psychiatry, Veteran Health Service Medical Center , Seoul , Republic of Korea
5. Seoul National University College of Medicine , Seoul , Republic of Korea
6. Department of Psychiatry, Sungkyunkwan University College of Medicine, Samsung Medical Center , Seoul , Republic of Korea