1. Department of Psychiatry; Yeouido St Mary's Hospital; Seoul; Korea
2. Department of Psychiatry; St Vincent's Hospital; The Catholic University of Korea; Seoul; Korea
3. Department of Neuropsychiatry; College of Medicine; Inje University; Seoul; Korea
4. Department of Psychiatry; Pochon Cha University; Gumi; Korea
5. Department of Psychiatry; Bucheon St Mary's Hospital; The Catholic University of Korea; Seoul; Korea
6. Department of Psychiatry; College of Medicine; Yeungnam University; Daegu; Korea