Ouyang, Yan
Yi, Yan
Gong, Fei
Lin, Ge
Li, Xihong
Funding for this research was provided by:
Science and technology project of Health and Family Planning Commission of Hunan Province (C20180898)
the Citic-Xiangya Research Fund (KYXM-201703)
Article History
Received: 18 May 2018
Accepted: 20 August 2018
First Online: 29 August 2018
Compliance with Ethical Standards
:
: The authors declare that they have no competing interests.
: Not applicable.
: The authors report no financial or commercial conflicts of interest.
: This retrospective study was approved by the Institutional Review Board of the Reproductive and Genetic Hospital of Citic-Xiangya.