1. Department of Public Health, College of Medicine, National Cheng Kung University , No. 1, University Rd., East Rd., Tainan, 701 , Taiwan
2. Graduate Institute of Food Safety, National Chung Hsing University , No. 250, Kuo Kuang Rd., Taichung, 402 , Taiwan
3. Department of Public Health, College of Public Health, China Medical University , No. 100, Section 1, Jingmao Rd., Taichung, 406 , Taiwan
4. Department of Healthcare Administration, College of Medical and Health Science, Asia University , No.500, Lioufeng Rd., Taichung, 413 , Taiwan