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For this open access journal, all published articles are made immediately and permanently free for everyone to read and download under an open access license. Permitted third party (re)use is defined by the following Creative Commons user licenses (CC BY-NC-ND). Under this license, everyone has free and unlimited access to the full text of the published articles, and is free to re-use the published material under these terms: by giving credit to the author, providing the citation of the original publication, not using for commercial purposes and not distributing the article if you have modified it.