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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. 1 — Work flow diagram. NPC nasopharyngeal carcinoma, 2DRT two-dimensional radiotherapy, 3DRT three-dimensional radiotherapy, RPLN retropharyngeal lymph node, CLN cervical lymph node, PET/CT ¹⁸F-fluorodeoxyglucose positron emission tomography and computed tomography, ENPG endoscopic nasopharyngectomy, IMRT intensity-modulated radiotherapy