1. Division of Cardiology, Department of Internal Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2. Cardiovascular Research Institute, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Biostatistics and Computing, The Graduate School, Yonsei University, Seoul, Korea.
4. Department of Medicine, Graduate School, Kyung Hee University, Seoul, Korea.
5. Department of Clinical Pharmacology and Therapeutics, College of Medicine, Kyung Hee University, Seoul, Korea.