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. 2017 Nov 22;17:118. doi: 10.1186/s12876-017-0693-7

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — The Hill grades of GEFV. GEFV was graded from I through IV prospectively during endoscopic examination based on the Hill classification: Grade I: The fold of tissue approximated to the endoscope closely; Grade II: The fold of tissue is less prominent than Grade I. The tissue around the endoscope could open during respiration and close rapidly; Grade III: The fold of tissue is barely prominent and the endoscope is not gripped by the tissue tightly; Grade IV: There is no prominent fold of tissue at all and a hiatal hernia is present