Published on in Vol 8 , No 7 (2020) :July
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18226, first published
.

1 College of Software Engineering, Southeast University, Nanjing, CN
2 TerryDr Infomation Technology, Nanjing, CN
3 The Fourth Hospital of Hebei Medical University, ShiJiaZhuang, CN