1. Department of Internal Medicine, Gangnam Severance Hospital, Institute for Vascular and Metabolic Research, Yonsei University College of Medicine, Seoul, Republic of Korea.
2. Department of Psychiatry, Gangnam Severance Hospital, Institute for Behavioral Science in Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea.
3. Department of Internal Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin, Republic of Korea.