Funding for this research was provided by:
Shanxi Provincial Key Research and Development Project (no.201803D31167 and no.20150313007-7)
Received: 6 September 2019
Accepted: 26 November 2019
First Online: 6 December 2019
Ethics approval and consent to participate
: This study was approved by the ethics committee of Shanxi Tumor Hospital. All patients signed informed consent.
: The patient was given his consent for information about himself to be published in World Journal of Surgical Oncology<i>.</i>
: The authors declare that they have no competing interests.