Funding for this research was provided by:
Kadoorie Charitable Foundation
Wellcome (088158/Z/09/Z, 202922/Z/16/Z, 104085/Z/14/Z)
National Key Research and Development Program of China (2016YFC0900504, 2016YFC0900502, 2016YFC0900500, 2016YFC0900501)
Received: 23 October 2020
Accepted: 15 January 2021
First Online: 8 February 2021
Ethics approval and consent to participate
: The CKB study was approved by the Ethical Review Committee of the Chinese Center for Disease Control and Prevention and the Oxford Tropical Research Ethics Committee, University of Oxford. All participants eligible for this study had completed a written informed consent form prior to the survey.
: Not applicable.
: The authors declare that they have no competing interests.