Funding for this research was provided by:
Scientific and technological innovation joint capital projects of Fujian Province, China (2016Y9031)
Fujian province medical innovation project (2015-CXB-16)
Text and Data Mining valid from 2019-09-03
Received: 9 September 2018
Accepted: 30 July 2019
First Online: 3 September 2019
Ethics approval and consent to participate
: The study was approved by the ethics committee of Fujian Union Hospital. Because patient data in the SEER database were de-identified, signed informed consent was waived for the present study.
: Not applicable.
: The authors have no conflicts of interest associated with the publication of this manuscript to declare. The authors report no relevant financial disclosures related to this current work.