Published on in Vol 8, No 5 (2020): May
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/18627, first published
.
1 School of Computer and Information Technology, Shanxi University, Taiyuan, China
2 Complex Systems Research Center, Shanxi University, Taiyuan, China
3 College of Mathematics, Shanxi University of Technology, Taiyuan, China