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. 2017 Jul 11;3:18. doi: 10.1186/s40780-017-0087-6

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© The Author(s). 2017

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 — A study selection flow diagram. n: total number of articles. *We included 24 studied from 22 articles because 2articles [26, 47] included 2 studies each. Abbreviations: PMDA, Pharmaceutical Medicines Devices Agency