Lu, Guilan
Peng, Xiaomin
Li, Renqing
Liu, Yimeng
Wu, Zhanguo
Wang, Xifeng
Zhang, Daitao
Zhao, Jiachen
Sun, Ying
Zhang, Li
Yang, Peng
Wang, Quanyi
Funding for this research was provided by:
Capital's Funds for Health Improvement and Research (2018-1-1012)
Article History
Received: 29 November 2019
Accepted: 14 July 2020
First Online: 23 July 2020
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of Beijing CDC. Written informed consent was obtained from all the participants or the guardians if participants were under 16 years of age.
: Not applicable.
: The authors declare no competing interests.