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. 2017 Jun 23;7:4144. doi: 10.1038/s41598-017-04379-0

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Vessel tree maps generated on Analyze. Panel (a) is a screenshot showing part of a tree map of vessels. The yellow dot at the top represents the root of all the vessels (umbilical cord insertion point). True branch points and terminal branch points are marked in blue and red dots respectively. Each point is labelled with alphabets designating the branch generation/level and numbers designating the branch number at each level. Panel (b) shows a sample tree map grouped into decile (ten groups) of branching. In this example, the total level of branching (excluding the root) was eighty. This was divided into ten groups containing eight levels each. The number of branches in each group was counted.