Our periodical is an open access journal. All content is freely available without charge to users or their institutions. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission of the publisher or the author. The journal does not charge fees for article processing or submission. Articles published in the journal are distributed under a Creative Commons Attribution 4.0 (CC BY 4.0) license.