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. 2018 May 9;38:20. doi: 10.1186/s40880-018-0286-z

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© The Author(s) 2018

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 — Study protocol for sampling of retropharyngeal lymph nodes (RLNs) with fine needle aspiration under endoscopic ultrasound guidance in post-radiotherapy patients with nasopharyngeal carcinoma. The RLNs were evaluated via magnetic resonance imaging using the New Response Evaluation Criteria in Solid Tumors: Revised RECIST guideline (version 1.1). European Journal of Cancer. 2009, (45): 228–247