1. Department of Psychiatry, Sungkyunkwan University School of Medicine, Kangbuk Samsung Hospital, Seoul, Korea
2. Department of Psychiatry, Yeungnam University School of Medicine, Daegu, Korea
3. Department of Psychiatry, National Medical Center, Seoul, Korea
4. Department of Psychiatry, Inje University School of Medicine, Ilsan Paik Hospital, Goyang, Korea
5. Department of Psychiatry, Gachon University College of Medicine, Gil Medical Center, Incheon, Korea