1. Department of Cardiovascular Medicine, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea
2. Department of Preventive Medicine, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea
3. Department of Laboratory Medicine, Research Institute of Medical Science, Konkuk University School of Medicine, Seoul, Korea
4. Department of Preventive Medicine, College of Medicine, Dong-A University, Busan, Korea