Published on in Vol 6, No 8 (2018): August
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/7674, first published
.
1 Institute of Medical Information & Library, Chinese Academy of Medical Sciences, Beijing, China
2 School of Biomedical Informatics, The University of Texas Health Science Center at Houston, Houston, TX, United States