Published on in Vol 7 , No 11 (2019) :November
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/15122, first published
.

1 SSK Research Center for Mental Health and Communal Society, Kwangwoon University, Seoul, KR
2 Division of General Medicine and Clinical Epidemiology, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, US