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Authors
Zhang, Guowei
Cheng, Ruirui
Wang, Huijuan
Zhang, Yong
Yan, Xiangtao
Li, Peng
Zhang, Mina
Zhang, Xiaojuan
Yang, Jinpo
Niu, Yuanyuan
Ma, Zhiyong
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Article History
Received: 8 March 2019
Accepted: 23 December 2019
First Online: 6 January 2020
Compliance with ethical standards
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: None of the authors have actual or potential conflicts of interest, including any financial, personal or other relationships with other people or organizations that could inappropriately influence (bias) this article, to declare.
: This study was approved by the ethics committees of the Affiliated Cancer Hospital and the First Affiliated Hospital of Zhengzhou University. The approval dates were October 12, 2018 and October 24, 2018, respectively. We confirm that all methods were performed in accordance with the relevant guidelines and regulations.
: Due to the retrospective nature of the study and because no patient specimens were used, the requirement for informed consent was waived by the ethics committees.
