Published on in Vol 21, No 2 (2019): February
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/10724, first published
.
1 Department of Urban Engineering, Graduate School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
2 Department of Public Health, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan