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. 2018 May 11;15:25. doi: 10.1186/s12954-018-0230-1

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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. 3 — Availability and coverage of needle and syringe programs (NSPs) in European prisons. Green: NSP available in all prisons; yellow: NSP officially available in all prisons, but not in use due to enrollment requirements; orange: NSP available in at least one prison; red: NSP not available in prisons; gray: not part of the Hep-CORE dataset