Liu, Peipei
Fan, Jiajun
Wang, Ziyu
Zai, Wenjing
Song, Ping
Li, Yongping
Ju, Dianwen
Funding for this research was provided by:
National Natural Science Foundation of China (81773620, 81803529, 81573332)
Shanghai Sailing Program (17YF1405100)
Key Specialty Construction Project of Pudong Health and Family Planning Commission of Shanghai (PWZzk2017-32)
PDH-SPFDU Joint Research Fund
Jiangsu Provincial Commission of Health and Family Planning (201640036)
Article History
Received: 17 May 2020
Accepted: 27 May 2020
First Online: 3 June 2020
Ethics approval and consent to participate
: Not applicable.
: All authors read the manuscript and expressed their consent for publication.
: The authors declare that they have no competing interests.