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Article History

Received: 1 April 2020

Accepted: 20 August 2020

First Online: 28 August 2020

Ethics approval and consent to participate

: We have read and abided by the statement of ethical standards for manuscripts submitted to BMC gastroenterology. The Ethics Committee of the Affiliated Hospital of Zunyi Medical University approved this retrospective study. Our access to the data used in this study was approved by the Ethics Committee. Verbal informed consent was obtained from each patient, and the Ethics Committee approved this procedure. Since this is a retrospective study, a waiver of written informed consent was obtained from the Ethics Committee.

: Written informed consent for publication was obtained from all patients. Copies of the consent forms containing personal or clinical details or any identifying images published in this study are available upon request.

: The authors declare that they have no competing interests.