1 Department of Psychiatry, Seoul National Hospital, Seoul, Korea.
2 Department of Mental Health Research, Seoul National Hospital, Seoul, Korea.
3 Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Schizophrenia and Bipolar Disorder Program, McLean Hospital, Belmont, MA, USA.
4 Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA; Department of Psychiatry, Samsung Medical Center and Sungkyunkwan University School of Medicine, Seoul, Korea.
5 Department of Mental Health Research, Seoul National Hospital, Seoul, Korea; Department of Psychiatry, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA. Electronic address: swroh@korea.kr.