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. 2019 Apr 4;9:5621. doi: 10.1038/s41598-019-42145-6

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Global distribution of 98 sites all over the world. These study sites were extracted from 56 published papers. The source of spatial world map was made with Natural Earth. No permission is needed to use Natural Earth (https://www.naturalearthdata.com/about/terms-of-use/). The map was generated using Esri ArcMap 10.0 (https://www.arcgis.com).