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. 2016 Jul 15;14:184. doi: 10.1186/s12957-016-0941-2

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© The Author(s). 2016

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. 4 — Flow chart of the search, selection, and inclusion processes for the systematic review of the literature. An example PubMed search equation: ((“spleen”[MeSH Terms] or “spleen”[all fields] or “splenic neoplasms”[MeSH terms] or “splenic metastasis”[all fields]) and (“neoplasm metastasis”[MeSH Terms] or (“neoplasm”[all fields] and “metastasis”[all fields]) or “neoplasm metastasis”[all fields] or “metastasis”[all fields])) and (“nasopharynx”[MeSH terms] or “nasopharyngeal neoplasms”[MeSH terms] or “nasopharynx”[all fields] or “nasopharyngeal”[all fields])