Qi, Wenjuan
Li, Hongyan
Lian, Qiguo
Zuo, Xiayun
Yu, Chunyan
Lou, Chaohua
Tu, Xiaowen
Funding for this research was provided by:
CHINA/UNESCO - the Great Wall Fellowship (4500251526-A1)
Article History
Received: 3 January 2022
Accepted: 19 May 2023
First Online: 6 June 2023
Declarations
:
: This study received approval from the Medical Ethical Committee of Shanghai Institute of Planned Parenthood Research (IRB # PJ2014-41). Informed consent or assent was obtained from participants, parents as well as school teachers before data collection.
: Not applicable.
: The authors declare that they have no competing interests.