Funding for this research was provided by:
National Natural Science Foundation of China (81872427, 81672428)
Haiyan Fund Project of Harbin Medical University Cancer Hospital (JJZD2020-17, JJQN2019-02)
Health Commission of Heilongjiang (2019-060)
Text and Data Mining valid from 2020-05-06
Received: 12 November 2019
Accepted: 14 April 2020
First Online: 6 May 2020
Ethics approval and consent to participate
: All participants gave written informed consent. This study was conducted according to the Declaration of Helsinki and was approved by the Institutional Ethics Committee of Harbin Medical University Cancer Hospital.
: Not applicable.
: The authors declare that they have no competing interests.