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Article History

Received: 19 August 2020

Accepted: 6 January 2021

First Online: 27 January 2021

Compliance with Ethical Standards

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: Qiang Cai, MD, PhD, FACG, is a guarantor of the article. Specific author contributions: Huimin Chen, MD, PhD, searched the literature and wrote the original draft; Lucie F. Calderon, MD, Rushikesh Shah, MD, Wei Zheng, MD, Yue Xue, MD, and Steve Keilin, MD, searched the endoscopic photographs, revised the manuscript, and approved the final draft. Liang Xia, MD, PhD, Wei Wang, MD, Lianyong Li, MD, PhD, Baiwen Li, MD, PhD, and Steve Keilin, MD, revised the original draft and approved the final draft. Qiang Cai, MD, PhD, FACG, designed the concept and format of the article, provided endoscopic photographs, and revised and approved the final draft.

: Informed consent was obtained from the patients for the publication of their information and imaging.