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. 2018 Dec 27;18:337. doi: 10.1186/s12886-018-0999-4

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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 — The densitometry values over Φ2–6 mm of the anterior layer, central layer, posterior layer, and total layer of the corneas measured before and at 6, 12 and 24 months after ATE-CXL. (The asterisk refers to a significant difference that was detected when compared with the preoperative value. The octothorpe refers to a significant difference that was detected when compared with the value obtained at post-operative month 12)