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. 2018 Mar 21;6:90. doi: 10.3389/fpubh.2018.00090

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Copyright © 2018 Gianfredi, Bragazzi, Nucci, Martini, Rosselli, Minelli and Moretti.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Communicable tropical/sub-tropical disorders and neglected tropical diseases investigated and non conventional sources analyzed, according to our results. Line thicknesses represent the volume of studies retrieved.