Received: 20 August 2020
Accepted: 2 January 2021
First Online: 8 March 2021
Ethics approval and consent to participate
: The present study was approved by the ethics committee of the Department of Hepatobiliary Surgery, Yantai Mountain Hospital. Ethics approval number is KT-KY-2018-02. Written informed consent was obtained from all patients and conducted in accordance with the Declaration of Helsinki.
: The authors declare that they have no competing interests.