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. 2019 Apr 18;45:51. doi: 10.1186/s13052-019-0640-z

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© The Author(s). 2019

Open Access This 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. 2 — Distribution of transports in Italy. Total number of transports within various Italian NETS in 2014; note that the four Turin NETS were grouped. Panel a: total number of transports. Panel b: total number back-transports