Published on in Vol 22, No 8 (2020): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/21176, first published
.
1 Department of Social Medicine and Health Management, Xiangya School of Public Health, Central South University, Changsha, China
2 Department of Mathematics and Statistics, Mzuzu University, Luwinga, Mzuzu, Malawi
3 Department of Epidemiology and Health Statistics, Xiangya School of Public Health, Central South University, Changsha, China