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Article History

Received: 15 June 2018

Accepted: 6 December 2018

First Online: 27 December 2018

Ethics approval and consent to participate

: The present study was conducted in accordance with the Declaration of Helsinki and approved by the Ethics Committee of Kamo Hospital and by the Ethical Review Board for Clinical Research of Toyosaka Hospital. Reference numbers were not assigned. Prior to the first endoscopy, written informed consent was obtained from each patient included in the study.

: Not applicable. (Images are entirely unidentifiable and there are no details on individuals reported in this manuscript.)

: The authors declare that they have no competing interests.

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