Funding for this research was provided by:
Xiamen Municipal Bureau of Science and Technology (3502Z20164009)
Scientific Research Foundation for Youth Talent of Xiamen Cancer Hospital (ZLYYB201801)
Received: 19 September 2018
Accepted: 5 February 2019
First Online: 19 February 2019
Ethics approval and consent to participate
: All patients gave their written informed consent. All data were retrospectively analyzed in an anonymized form.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.