1. Cardiovascular Center, Taichung Veterans General Hospital, Taichung, Taiwan
2. Institute of Clinical Medicine, Department of Medicine, National Yang-Ming University School of Medicine, Taipei, Taiwan
3. Department of Internal Medicine, Cheng Ching Hospital, Taichung, Taiwan
4. Division of Cardiology, Asia University Hospital, Taichung, Taiwan
5. Department of Medicine, National Yang Ming University School of Medicine, Taipei, Taiwan