1. Division of Cardiology, Department of Internal Medicine, Jeju National University Hospital, Jeju, Korea.
2. Stent Research and Development Center, Osstem Cardiotec, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, Inje University Ilsan Paik Hospital, Goyang, Korea.
4. Division of Cardiology, Department of Internal Medicine, Myongji Hospital, Goyang, Korea.