- Correspondence to Professor Sheng Wei, Department of Epidemiology and Biostatistics, The Ministry of Education Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, No.13 of Hangkong Road, Wuhan, Hubei 430030, China;
- Accepted October 1, 2015
- First published October 23, 2015.
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