Updates are available Correction dated 2018-09-21
Click to view Correction: https://doi.org/10.1136/svn-2017-000104corr1
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Authors
Li, Shanshan
Zhang, Xinjiang
Fang, Qi
Zhou, Junshan
Zhang, Meijuan
Wang, Hui
Chen, Yan
Xu, Biyun
Wu, Yanfeng
Qian, Lai
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Funding
Funding for this research was provided by:
the Natural Science Foundation of China
the National Key Research and Development Program of China
the National Natural Science Foundation of China
Jiangsu Province Commission of Health and Family Planning of China
