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. 2019 Sep 7;15:23. doi: 10.1186/s13005-019-0207-7

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© The Author(s). 2019

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 — Collaboration networks between institutions (defined as more than one collaboration). The size of the nodes is proportional to the number of articles published by each institution. Muenster University Hospital is located at the core of the most important network