1. Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital Yun-Lin Branch , Yun-Lin 640 , Taiwan
2. Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University , Taipei 100 , Taiwan
3. Cardiovascular Center, National Taiwan University Hospital , Taipei 100 , Taiwan
4. Division of Cardiology, Department of Internal Medicine, National Taiwan University Hospital , Taipei 100 , Taiwan