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Authors
Wu, Junqing http://orcid.org/0000-0001-9421-2423
Zhang, Junguo
Li, Yuyan
Yang, Jinming
Zhou, Ying
Li, Yiran
Xu, Shuangfei
Zhao, Rui
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Funding
Funding for this research was provided by:
The National Science and Technology R&D Programme part of the 12th Five-Year Plan of China (No. 2012BAI32B08)
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Article History
Received: 16 April 2019
Accepted: 13 September 2019
First Online: 29 October 2019
Ethics approval and consent to participate
: This study was approved by the Research Ethics Committee of the Shanghai Institute of Planned Parenthood Research, WHO Collaborating Center on Human Research (code: PJ2014–20). The study was performed according to the Declaration of Helsinki. All participants in the study provided written consent.
: Not applicable.
: The authors declare that they have no competing interests.
