1. Department of Occupational Safety
and Health, China Medical University, No.
91 Hsueh-Shih Road, Taichung 40402, Taiwan, Republic of China
2. Department of Safety, Health
and Environmental Engineering, National Kaohsiung First University of Science and Technology, No. 2, Jhuoyue
Road, Nanzih, Kaohsiung City 811, Taiwan, Republic of China