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.

In particular, all content is freely available without charge to the user or his/her institution. Users are allowed to read, download, copy, distribute/print a copy for personal and non-commercial use, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. This is inspired by the BOAI (Budapest Open Access Initiative) definition of open access.