1. Cardiovascular Center, Taipei Veterans General Hospital , No.201, Sec. 2, Shipai Rd., Beitou District, Taipei 11217 , Taiwan
2. Faculty of Medicine, Institute of Clinical Medicine, National Yang Ming Chiao Tung University , No. 155, Sec. 2, Linong St. Beitou Dist., Taipei 112304 , Taiwan
3. Cardiovascular Center, Taichung Veterans General Hospital , Taichung , Taiwan
4. Institute of Epidemiology and Preventive Medicine College of Public Health, National Taiwan University , Taipei , Taiwan
5. Department of Medical Research, Taichung Veterans General Hospital , Taichung , Taiwan
6. Department of Post Baccalaureate Medicine, College of Medicine, National Chung Hsing University , Taichung , Taiwan