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. This journal is open-access, which means that all content is freely available without charge to users or / institutions. Users are allowed to read, download, copy, distribute, print, search, or link to full-text articles in this journal without asking prior permission from the publisher or author as long as they acknowledge the original author as stated in CC-BY, - SA licence from Common Creative.