1. Division of Cardiology, Department of Internal Medicine, Taipei Veterans General Hospital , No. 201, Section 2, Shih-Pai Road, Taipei, Taiwan 11217, R.O.C
2. School of Medicine, National Yang-Ming Chiao-Tung University , No.155, Section 2, Linong Street, Taipei, 11221 Taiwan. R.O.C
3. Division of Cardiovascular Surgery, Department of Surgery, Taipei Veterans General Hospital , Taipei, Taiwan 11217, R.O.C
4. Division of Healthcare and Management, Healthcare Center, Taipei Veterans General Hospital , Taipei, Taiwan 11217, R.O.C