- Correspondence to Dr Dong-Hee Koh, Occupational Safety and Health Research Institute (OSHRI), Korea Safety and Health Agency (KOSHA), #34-4, Gusan-dong, Bupyeong-gu, Incheon, 403-711, Republic of Korea;
- Accepted January 18, 2010
- First published October 8, 2010.
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