1. Department of Psychiatry and Behavioral Science, Seoul National University College of Medicine, Seoul, Republic of Korea.
2. Department of Psychiatry, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea.
3. Department of Internal Medicine, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea.
4. Department of Biostatistics, SMG-SNU Boramae Medical Center, Seoul, Republic of Korea.