Document is current
Any future updates will be listed below
-
Authors
Liu, Ying
Xu, Jihong
Chen, Dian
Sun, Pei
Ma, Xu
-
Funding
Funding for this research was provided by:
Special Fund of the Chinese Central Government for Basic Scientific Research Operations (2016GJM03)
- License Information
-
More Information
Article History
Received: 9 February 2018
Accepted: 5 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: A written informed consent form was obtained from each participant before enrolment. The study was approved by Institutional Review Board of Chinese Association of National Research Institution for family planning.
: 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.
