1. Department of Psychiatry, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
2. Institute of Behavioral Sciences in Medicine, Yonsei University College of Medicine, Seoul, Korea
3. Department of Psychiatry, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Korea
4. Department of Pulmonary and Critical Care Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea
5. Department of Psychiatry, National Health Insurance Service Ilsan Hospital, Goyang, Korea