Published on in Vol 9, No 6 (2021): June
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/28272, first published
                                    .
                                

1 College of Computer Science and Technology, Dalian University of Technology, Dalian, China
2 Beijing Institute of Health Administration and Medical Information, Beijing, China
