Chang, Cheng
Sun, Xiaoyan
Zhao, Wenlu
Wang, Rui
Qian, Xiaohua
Lei, Bei
Wang, Lihua
Liu, Liu
Ruan, Maomei
Xie, Wenhui
Shen, Junkang
Funding for this research was provided by:
Natural Science Foundation of Shanghai (18ZR1435200)
National Natural Science Foundation of China (81602415, 81773007)
Scientific Research project of Shanghai Municipal Commission of Health and Family Planning (20174Y0077)
Article History
Received: 7 May 2019
Accepted: 13 November 2019
First Online: 10 December 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The institutional ethics review board approved this retrospective study and waived the need for informed consent.