1. Division of Cardiology, Myongji Cardiovascular Center, Myongji Hospital, Hanyang University College of Medicine, Goyang, Korea.
2. Division of Cardiology, Department of Internal Medicine, National Health Insurance Service Ilsan Hospital, Goyang, Korea.
3. Division of Cardiology, Department of Internal Medicine, Interventional Cardiology, Cardiovascular Center, Dongguk University Ilsan Hospital, Goyang, Korea.
4. Division of Cardiology, Department of Internal Medicine, Ilsan Paik Hospital, University of Inje College of Medicine, Goyang, Korea.