[1] Chung Shan Med Univ, Dept Occupat Safety & Hlth, Taichung 402, Taiwan
[2] Chung Shan Med Univ Hosp, Dept Occupat Med, Taichung 402, Taiwan
[3] Acad Sci Czech Republ, Inst Expt Med, Lab Genet Ecotoxicol, Prague 14220, Czech Republic
[4] Stockholm Univ, Wenner Gren Inst, Dept Mol Biosci, Ctr Radiat Protect Res, S-10691 Stockholm, Sweden
[5] Old Dominion Univ, Coll Hlth Sci, Sch Community & Environm Hlth, Norfolk, VA 23529 USA
[6] Chung Shan Med Univ, Dept Publ Hlth, Taichung 402, Taiwan