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. 2016 Sep 27;3:160084. doi: 10.1038/sdata.2016.84

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Copyright © 2016, The Author(s)

This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0 Metadata associated with this Data Descriptor is available at http://www.nature.com/sdata/ and is released under the CC0 waiver to maximize reuse.

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Boxes with solid lines represent the articles identified (orange), excluded (red) or included in the database (green). In these boxes, the number of articles (n_i) is indexed according to each step i of the literature search. Boxes with dashed edges represent the selection process, and selection criteria are indexed in italic.