1. Public Health Bureau of Miaoli County Government, No. 6, Guofu Road, Miaoli City, Miaoli County 360, Taiwan
2. Department of Healthcare Administration, College of Medical and Health Science, Asia University, No. 500, Lioufeng Road, Wufeng, Taichung 413, Taiwan
3. Institute of Environmental and Occupational Health Sciences, National Yang-Ming University, No. 155, Section 2, Li-Nong Street, Taipei 112, Taiwan
4. School of Public Health, National Defense Medical Center, No. 161, Section 6, Minquan E. Road, Neihu District, Taipei 114, Taiwan