Text and Data Mining valid from 2019-10-17
Received: 13 August 2019
Accepted: 10 September 2019
First Online: 17 October 2019
Ethics approval and consent to participate
: This study protocol conformed to clinical research guidelines and was approved by the research ethics committee of Harbin Medical University Cancer Hospital.
: Manuscript is approved by all authors for publication.
: The authors declare that they have no competing interests.