Wang, Zhiyang
Niu, Jinbo
Ji, Honglei
Miao, Maohua
Yang, Limei
Chen, Xia
Li, Xiufeng
Song, Xiuxia
Chen, Aimin
Liang, Hong http://orcid.org/0000-0002-3430-9167
Yuan, Wei
Article History
Received: 27 April 2021
Accepted: 15 June 2022
First Online: 29 June 2022
Declarations
:
: This study was approved by the ethical committees of the Shanghai Institute of Planned Parenthood Research. Parents or guardians provided written informed consent prior to enrollment.
: Consent for publication not required.
: The authors declare that they have no actual or potential competing financial interests.