Wu, Yu
Ye, Hanfeng
Liu, Jihong
Ma, Qiuyue
Yuan, Yanling
Pang, Qian
Liu, Jue
Kong, Cai
Liu, Min
Funding for this research was provided by:
National Natural Science Foundation of China (71874003)
Article History
Received: 8 January 2020
Accepted: 31 August 2020
First Online: 14 September 2020
Ethics approval and consent to participate
: All subjects gave their informed consent for inclusion before they participated in the study. The study was approved by Institutional Review Board of Chinese Association of Maternal and Child Health Studies (Project identification code AMCHS-2014-6).
: Not applicable.
: We declare no competing interests.