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. 2018 Apr 18;16:27. doi: 10.1186/s12969-018-0246-9

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© The Author(s). 2018

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. 1 — Participants to the first survey. Summarize the participation rate to the first survey, specifying number of recipients that not replied, number of recipients interested in the survey and number of recipients that filled the survey