1. Department of Psychiatry, Asan Medical Center; Ulsan University College of Medicine; Seoul Korea
2. Department of Psychiatry; Seoul National Hospital; Seoul Korea
3. Department of Psychiatry; Yale University School of Medicine; New Haven CT USA
4. VA Connecticut Healthcare System; Connecticut USA
5. Department of Clinical Epidemiology and Biostatistics, Asan Medical Center; Ulsan University College of Medicine; Seoul Korea
6. Department of Oncology, Asan Medical Center; Ulsan University College of Medicine; Seoul Korea