Published on in Vol 8 , No 8 (2020) :August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18370, first published
.

1 School of Data Science, City University of Hong Kong, Kowloon, HK
2 Centre for Systems Informatics Engineering, City University of Hong Kong, Kowloon, HK