Corresponding Author

Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, Tainan, Taiwan

Department of Occupational and Environmental Medicine, National Cheng Kung University Hospital, Tainan, Taiwan

Correspondence

How-Ran Guo, Department of Environmental and Occupational Health, College of Medicine, National Cheng Kung University, 138 Sheng-Li Rd, Tainan 704, Taiwan.

Email: hrguo@mail.ncku.edu.tw