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This journal provides immediate fulltext open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge. All articles published Open Access will be immediately and permanently free for everyone to read and download. Articles are freely available to both subscribers and the wider public following Creative Commons Attribution-ShareAlike (CC BY-SA). We are continuously working with our author communities to select the best choice of license options: Creative Commons Attribution-ShareAlike (CC BY-SA).