Chen, Yi http://orcid.org/0000-0002-3968-3916
Dai, Yan
Song, Jing
Wei, Ling
Ma, Ying
Tian, Ning
Wang, Qian
Zhang, Qian
Zhang, Yue
Wang, Xiao Lan
Zhang, Jun
Liu, Rong
Funding for this research was provided by:
Beijing Municipal Science & Technology Commission (Z181100001718091)
Article History
Received: 7 January 2019
Accepted: 6 August 2019
First Online: 13 August 2019
Ethics approval and consent to participate
: The protocol for recruitment and collection of baseline data and biological samples for the cohort has been approved by the Medical Ethics Committee of Beijing Obstetrics and Gynecology Hospital, Capital Medical University. All participants in this research provided their written consent.
: Not applicable.
: The authors declare that they have no competing interests.