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This journal provides immediate 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. Non-commercial use and distribution in any medium is permitted, provided the author and the journal are properly credited. We are continuously working with our author communities to select the best choice of license options, currently being defined for this journal as follows:• Creative Commons Attribution-ShareAlike (CC BY-SA)