This collection will provide immediate free access to its contents, based on the principle of making research freely available to the public to support a greater exchange of global knowledge. The volumes will be published in electronic format under a Creative Commons Attribution-NonCommercial-NoDerivative license 4.0. They may be copied, used, disseminated, transmitted and publicly displayed, provided the authorship, URL, and Editorial are cited, and that content is not used for commercial purposes. A limited number of hard copies will be printed on demand.