1. Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Korea.
2. Division of Infectious Diseases, Department of Internal Medicine, School of Medicine, Kyungpook National University, Kyungpook National University Chilgok Hospital, Daegu, Korea.
3. Department of Emergency Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.
4. Department of Psychiatry, School of Medicine, Kyungpook National University, Daegu, Korea.
5. Department of Psychiatry, National Medical Center, Seoul, Korea.
6. Department of Psychiatry, Chonnam National University Medical School, Gwangju, Korea.
7. Department of Psychiatry, Seoul National University Hospital, Seoul, Korea.
8. Department of Preventive Medicine, School of Medicine, Kyungpook National University, Daegu, Korea.