1. Cardiovascular Center and Department of Anesthesiology, Taichung Veterans General Hospital, Taichung, Taiwan
2. Department of Internal Medicine, Division of Cardiology, Taichung Armed Forces General Hospital, Taichung, Taiwan
3. Department of Medicine and Department of Surgery, Institute of Clinical Medicine, Yang-Ming University School of Medicine, Taipei, Taiwan
4. Department of Medicine, Chung-Shan Medical University School of Medicine, Taichung, Taiwan