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. 2017 Feb 2;1(1):60–66. doi: 10.1017/cts.2016.10

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© The Association for Clinical and Translational Science 2017

This is an Open Access article, distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike licence (http://creativecommons.org/licenses/by-nc-sa/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the same Creative Commons licence is included and the original work is properly cited. The written permission of Cambridge University Press must be obtained for commercial re-use.

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Fig. 3 — Directed citation network. Nodes represent papers in the corpus. Directed edges represent a citation of the target by the source. Size and color of each node reflects the number of times that paper was cited by other papers in the corpus (red, large—high citation count; yellow, small—low citation count; and green, tiny—no citation count). Height of a node corresponds to year of first availability either in print or online.