Editorial note

License

Authors who publish in this journal accept the following conditions: 

1. Authors retain the copyright and assign the right of first publication to the journal, with the work registered under a  Creative Commons attribution license (CC-BY), which allows third parties to use what is published whenever they mention the authorship of the work and the first publication in this magazine.
2. Authors can make other independent and additional contractual agreements for the non-exclusive distribution of the article published in this journal (e.g., include it in an institutional repository or publish it in a book) as long as they clearly indicate that the work was published for the first time in this magazine.
3. Authors are allowed and encouraged to publish their work on the Internet (e.g., on institutional or personal webpages) before and during the review and publication process, as it can lead to productive exchanges and greater and faster dissemination of published work (see The Effect of Open Access ).