Hu, Zhen
Yan, Xiaojin
Song, Yi
Ma, Shang
Ma, Jun
Zhu, Guangrong
Funding for this research was provided by:
the Medical Research Ethics Committee of the Peking University Health Science Center (IRB00001052–18002)
Article History
Received: 2 June 2020
Accepted: 8 September 2021
First Online: 23 September 2021
Declarations
:
: The project was approved by the Medical Research Ethics Committee of Peking University Health Science Center (IRB00001052-18002). All participants in the study were 12 years old. With data collected from schools across China, the school principals determined the process for gaining informed parental consent (i.e., written vs. verbal, active vs. passive); informed consent was obtained from both children and their parents. The procedures of CNSSCH have been published previously and kept uniform during the 20-year period [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.