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. 2018 Apr 17;18:50. doi: 10.1186/s12876-018-0779-x

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© The Author(s). 2018

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. 2 — a Comparison of the prevalence of Helicobacter pylori infection between low and mid-to-high latitude zones (39.92% ± 21.15% vs. 52.56% ± 19.88%, *P = 0.05); b Comparisons of the prevalence of H. pylori infection in each 15°-latitude zone; c Comparison of the prevalence of H. pylori infection between developed and developing regions (43.48% ± 17.73% vs. 57.42% ± 21.76%, **P = 0.009); d Comparisons of the prevalence of H. pylori infection in developed countries and mid-to-high latitude zones, developing countries and mid-to-high latitude zones, developed countries and low latitude, developing countries and low latitude zones (P < 0.001)