Published on in Vol 7, No 3 (2019): March
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11437, first published
.
1 College of Medicine, Nankai University, Tianjin, China
2 Department of Cardiology, Chinese People's Liberation Army General Hospital, Beijing, China
3 Department of Geriatric Cardiology, Chinese People's Liberation Army General Hospital, Beijing, China