Received: 13 September 2018
Accepted: 15 January 2019
First Online: 26 January 2019
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of the Harbin Medical University Cancer Hospital.
: We obtained the consent to publishing the paper.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.