Ma, Ying
Pei, Yan
Yin, Chenghong
Jiang, Yuxin
Wang, Jingjing
Li, Xiaofei
Li, Lin http://orcid.org/0000-0002-3597-3350
Kagan, Karl Oliver
Wu, Qingqing
Funding for this research was provided by:
National Key Research and Development Program of China (2016YFC1000104, 2016YFC1000101)
Beijing Municipal Administration of Hospitals’ Ascent Plan (DFL20151302)
National Science and Technology Infrastructure Program (2014BAI06B05)
Article History
Received: 9 January 2019
Accepted: 27 June 2019
First Online: 4 July 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the Ethics Committee of Beijing Obstetrics and Gynecology Hospital and was in accordance with the 1964 Helsinki Declaration and its later amendments.
: Each participant in this study signed an informed consent form.