- Correspondence to Dr Yuxin Zheng, Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China;
- Received February 26, 2015
- Revised September 19, 2015
- Accepted September 27, 2015
- First published October 21, 2015.
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