Published on in Vol 22, No 9 (2020): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/22227, first published
.
1 Department of Social Medicine, School of Public Health, China Medical University, Shenyang, China
2 Department of Gastroenterology, Benxi General Hospital, Liaoning Health Industry Group, Benxi, China
3 The University of Auckland, Auckland, New Zealand