Chen, Qi
Zhang, Jiayao
Xu, Yan
Sun, Hong
Ding, Zhen
Funding for this research was provided by:
Key Talent Project for Medical Young Scholars of Jiangsu Province (QNRC2016551)
Jiangsu Provincial Department of Human Resources and Social Security (BE2018745)
Article History
Received: 20 October 2019
Accepted: 15 April 2020
First Online: 10 June 2020
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Commission of Jiangsu Provincial Center for Disease Control and Prevention; all study participants provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.