Funding for this research was provided by:
The George Institute for Global Health
Received: 11 January 2021
Accepted: 6 June 2021
First Online: 26 June 2021
: The study was approved by the Peking University Medical School Ethical Review Board
: This manuscript has not been submitted for publication. All authors listed on the title page have read the manuscript, attest to the validity and legitimacy of the data and its interpretation, and agree to its submission.
: The study is sponsored by The George Institute for Global Health. The author(s) declare that they have no competing interests.