1. Department of Cardiology, Kyung Hee University Hospital at Gangdong, Kyung Hee University College of Medicine, Seoul, Korea.
2. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
4. Department of Internal Medicine, Korea University Anam Hospital, Korea University College of Medicine, Seoul, Korea.
5. Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Yonsei University, Seoul, Korea.
6. Department of Internal Medicine, Sanggye Paik Hospital, Inje University School of Medicine, Seoul, Korea.
7. School of Biosystem and Biomedical Science, Korea University, Seoul, Korea.
8. Division of Endocrinology and Metabolism, Department of Internal Medicine, Medical School, Jeonbuk National University, Jeonju, Korea.
9. Department of Public Health, Yonsei University Graduate School, Seoul, Korea.
10. Department of Endocrinology and Metabolism, Kyung Hee University Hospital at Gangdong, Kyung Hee University College of Medicine, Seoul, Korea.