1. Department of Psychiatry and Health Promotion Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Psychiatry, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Department of Psychiatry, University of Toronto, and the Mood Disorders Psychopharmacology Unit, University Health Network, Toronto, Ontario, Canada.
4. Department of Psychiatry, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.