This journal provides immediate and fully open access to its content on the principle that making research freely available to the public supports a greater global exchange of knowledge.

Upon submitting an article, authors are asked to indicate their agreement to abide by an open access Creative Commons license (CC-BY). The license permits any user to read, copy, redistribute and make derivative the material in any medium or format for any purpose, even commercially.

The benefits are:

• All articles are free to read, copy, distribute, and use (with attribution)
• Author retains copyright - not the publisher
• Complies with self-archiving mandates