Published on in Vol 21, No 10 (2019): October
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/13469, first published
.
1 International School, Jinan University, Guangzhou, China
2 School of Medicine, Jinan University, Guangzhou, China
3 School of Public Health, The University of Hong Kong, Hong Kong, China
4 HSBC Business School, Peking University, Shenzhen, China
*these authors contributed equally