1. Division of Cardiology, Department of Internal Medicine Chungnam National University Hospital, College of Medicine, Chungnam National University Daejeon Republic of Korea
2. Department of Medical Sciences, College of Medicine Chungnam National University Daejeon Republic of Korea
3. Research Institute for Medical Sciences, College of Medicine Chungnam National University Daejeon Republic of Korea
4. Department of Physiology, College of Medicine Chungnam National University Daejeon Republic of Korea