- Correspondence to Professor Hai-Feng Pan and Professor Dong-Qing Ye, Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, 81 Meishan Road, Hefei 230032, China; ,
- Received December 6, 2016
- Revised March 9, 2017
- Accepted March 19, 2017
- First published April 28, 2017.
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