1. Institute of Clinical Medicine; National Cheng Kung University Hospital; College of Medicine; National Cheng Kung University; Tainan Taiwan
2. Department of Internal Medicine; National Cheng Kung University Hospital; College of Medicine; National Cheng Kung University; Tainan Taiwan
3. Department of Public Health; College of Medicine; National Cheng Kung University; Tainan Taiwan
4. Environmental and Occupational Medicine; College of Public Health; National Taiwan University; Taipei Taiwan
5. Institute of Epidemiology and Preventive Medicine; College of Public Health; National Taiwan University; Taipei Taiwan
6. Department of Business Administration; National Taiwan University of Science and Technology; Taipei Taiwan