1. Department of Psychiatry, Soonchunhyang University College of Medicine, Seoul, Republic of Korea.
2. Department of Psychiatry, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Republic of Korea.
3. Department of Psychiatry, Korea University College of Medicine, Seoul, Republic of Korea.
4. Department of Psychiatry, Gangnam Eulji Hospital, Eulji University, Seoul, Republic of Korea.