1. Department of Internal Medicine, Faculty of Medicine, Chiang Mai University, Intawaroroj Road, Chiang Mai 50200, Thailand
2. Division of Cardiology, Department of Medicine, Taipei Veterans General Hospital, No 201, Sec. 2, Shih-Pai Road, Taipei 112, Taiwan
3. School of Medicine, Institute of Clinical Medicine, and Cardiovascular Research Center, National Yang-Ming University, No.155, Sec.2, Linong Street, Taipei 112, Taiwan
4. Institute of Epidemiology and Preventive Medicine College of Public Health, National Taiwan University, No.17 Xu-Zhou Road, Taipei 10020, Taiwan