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. 2015 Sep 15;44(1):37. doi: 10.1186/s40463-015-0091-5

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© Clark et al. 2015

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. 1 — Inclusion and exclusion criteria. OPSCC – oropharyngeal squamous cell carcinoma, CRT – chemoradiation, PET-CT – positron emission tomography – computed tomography, N0 – no nodal disease. Patients who were treated with initial surgical resection and neck dissection +/− radiation/chemoradiation were considered to have primary surgical treatment