Funding for this research was provided by:
National Key Research and Development Program of China (2016YFC0900600/2016YFC0900603)
Beijing Municipal Key Laboratory of Clinical Epidemiology
Received: 17 March 2021
Accepted: 17 May 2021
First Online: 1 June 2021
: The CHCN-BTH study was approved by the Ethics Committee of Center of Disease Control (IRB2017–003, CYCDPCIRB-20170830-1) and Capital Medical University (2018SY81), and written informed consent was obtained from all individuals prior to the baseline survey.
: Not applicable.
: All authors declare that they have no competing interests.