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. 2018 Jan 22;160(3):487–496. doi: 10.1007/s00701-018-3467-2

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© The Author(s) 2018

Open Access This 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.

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Fig. 5 — Operative treatment algorithm for SI, modified according to Stuer et al. and Hadjipavlou et al. [37, 78]