Funding for this research was provided by:
National Natural Science Foundation of China (no.81671689, no.81501477)
FDCT grant (FDCT101/2015/A3)
Text and Data Mining valid from 2019-09-16
Received: 24 July 2019
Accepted: 12 September 2019
First Online: 16 September 2019
Ethics approval and consent to participate
: The study was approved by the Ethics Committee of Second Affiliated Hospital of Harbin Medical University. Patients who participated in this research had complete clinical data. Signed informed consents were obtained from the patients or the guardians.
: Not applicable.
: The authors declare that they have no competing interests.