1. Department of Dental Hygiene; China Medical University; Taichung Taiwan
2. Department of Occupational Medicine; Changhua Christian Hospital; Changhua Taiwan
3. Department of Leisure Services Management; Chaoyang University of Technology; Taichung Taiwan
4. Institute of Labor, Occupational Safety and Health; Ministry of Labor; New Taipei City Taiwan
5. Department of Occupational Safety and Health; Chung Shan Medical University; Taichung Taiwan
6. Department of Occupational Medicine; Chung Shan Medical University Hospital; Taichung Taiwan