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Article History

Received: 28 July 2020

Accepted: 27 November 2020

First Online: 7 December 2020

Ethics approval and consent to participate

: The Ethics Committee of the 4th hospital of Hebei Medical University (Hebei Tumor Hospital) approved the study protocol. Patients’ oral consent but not the written version was obtained owing to the retrospective design.

: All authors consent to publish.

: The authors declare that they have no competing interests.