Published on in Vol 20, No 9 (2018): September
Preprints (earlier versions) of this paper are
available at
https://preprints.jmir.org/preprint/11087, first published
.
1 Department of Oncology, The Second Xiangya Hospital, Central South University, Changsha, Hunan, China
2 Department of Geriatric Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China