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. 2019 Sep 18;15:59. doi: 10.1186/s13223-019-0373-y

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© The Author(s) 2019

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 — PRISMA diagram. PRISMA diagram of the study shows the methodology of selecting studies for the review. Results of searches from indexed databases (PUBMED, LILACS and Cochrane) and clinical trial registries (ClinicalTrials.gov, International Standard Randomised Controlled Trials Number -ISRCTN, International Clinical Trial Registry Platform—ICTRP) are shown parallel. After screening 732 entries from indexed databases and 95 entries from clinical trial registries 16 studies were included in qualitative analysis. Further 22 case reports and six small case series summarised