Hu, Xiaopeng
Ao, Junping
Li, Xinyue
Zhang, Huijuan
Wu, Ji
Cheng, Weiwei http://orcid.org/0000-0003-2734-6848
Funding for this research was provided by:
National Basic Research Program of China (2013CB967401)
National Natural Science Foundation of China (81370675, 81370727, 81421061)
National Natural Science Foundation of China (81720108017)
Shanghai Municipal Commission of Health and Family Planning (201610361)
Article History
Received: 7 December 2017
Accepted: 27 March 2018
First Online: 10 April 2018
Ethics approval and consent to participate
: The study was approved by the Research Ethic Committees at the International Peace Maternity and Child Health Hospital of China Welfare Institute, SJTUM, China.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.