1. Cardiovascular Center, National Taiwan University Hospital Yun-Lin Branch, Douliou, Taiwan
2. Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University College of Public Health, Taipei, Taiwan, Department of Occupational Medicine, Ton Yen General Hospital, Hisn-Chu County, Taiwan
3. Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
4. Cardiovascular Center, Buddhist Tzu Chi General Hospital, Taipei County, Taiwan,