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. 2014 Nov 4;9(11):e111916. doi: 10.1371/journal.pone.0111916

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© 2014 Verdonck et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Evolution of the ONSD in individual patients (thin lines) and mean value (thick line) over the course of the procedure. *indicates significant differences with post-operative values.