1. Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
2. Division of Endocrinology, Department of Internal Medicine, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
3. Severance Check-up, Severance Hospital, Yonsei University Health System, Seoul, Korea.
4. Severance Executive Healthcare Clinic, Severance Hospital, Yonsei University Health System, Seoul, Korea.
5. Division of Cardiology, Severance Cardiovascular Hospital, Yonsei University College of Medicine, Yonsei University Health System, Seoul, Korea.
6. Department of Internal Medicine, Eulji University Hospital, Daejeon, Korea.