Zhao, Yanxia
Bao, Heling
Ma, Lan
Song, Bo
Di, Jiangli
Wang, Linhong
Gao, Yanqiu
Ren, Wenhui
Wang, Shi
Wang, Hai-Jun
Wu, Jiuling
Funding for this research was provided by:
Chinese key project of public health programme
Young Scientists Fund (81903328)
Article History
Received: 21 March 2021
Accepted: 7 June 2021
First Online: 15 July 2021
Declarations
:
: Ethical approval for the NACCSPRA is provided by the Ethics Committee of the National Center for Women and Children’s Health, Chinese Center for Disease Control and Prevention. All participants provided the written informed consent before the screening procedures. The Ethics Committee approved the use of the database and the present study protocol and waived the informed consent from the individual as the data used in this study were obtained from a national programme established by the government.
: Not applicable.
: The authors declare that they have no conflicts of interest.