Funding for this research was provided by:
Major Research Plan (No. 31371147)
Article History
Received: 11 November 2019
Accepted: 12 January 2020
First Online: 30 January 2020
Ethics approval and consent to participate
: This study was performed in accordance with the World Medical Association Declaration of Helsinki and was approved by the Ethics Committee of Cancer Hospital of China Medical University. This study was a retrospective study and all the data used for the final analysis were anonymous. Therefore, the informed consent from the enrolled patients was waived. The institutional review board of our hospital gave the ethics approval for this study.
: Not applicable.
: The authors declare that they have no competing interest.