1. Cardiovascular Center, Dongguk University Ilsan Hospital, Goyang, Korea.
2. Department of Statistics, Survey and Health Policy Research Center, Dongguk University, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, College of Medicine, Dongguk University, Gyeongju, Korea.
4. Division of Nephrology, Dongguk University Ilsan Hospital, Goyang, Korea.
5. Department of Clinical Pharmacology and Therapeutics, Dongguk University Ilsan Hospital, Goyang, Korea.