Published on in Vol 8, No 12 (2020): December
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/23357, first published
.
1 Harbin Institute of Technology, Shenzhen, China
2 Peng Cheng Laboratory, Shenzhen, China
3 Yidu Cloud Technology Company Limited, Beijing, China