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 an open-access journal, 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 acknowledge the original author as stated in the CC-BY-SA licence from Creative Commons.

Benefits of open access for authors, include:

• Free access for all users worldwide
• Authors retain copyright to their work
• Increased visibility and readership
• Rapid publication
• No spatial constraints

This is in accordance with the Budapest Open Access Initiative