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. 2019 Nov 15;39:75. doi: 10.1186/s40880-019-0415-3

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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 — Kaplan–Meier curves of overall survival (a), local relapse-free survival (b), regional relapse-free survival (c) and distant metastasis-free survival (d) for stage I NPC patients with ENPG and IMRT. ENPG endoscopic nasopharyngectomy, IMRT intensity modulated radiation therapy