1. Department of Psychiatry, Pusan National University Yangsan Hospital, Yangsan, Republic of Korea.
2. Department of Psychiatry, Bongseng Memorial Hospital, Busan, Republic of Korea.
3. Department of Psychiatry, Pusan National University College of Medicine, Busan, Republic of Korea.
4. Department of Psychiatry, Inje University Paik Hospital, Busan, Republic of Korea.
5. Department of Psychiatry, Kosin University Gospel Hospital, Busan, Republic of Korea.
6. Department of Psychiatry, Dong-A University Medical Center, Busan, Republic of Korea.
7. Department of Psychiatry, Maryknoll Medical Center, Busan, Republic of Korea.
8. Department of Statistics, Pusan National University, Busan, Republic of Korea.