© The Author(s) (Frontiers)

Copyright Holders: © The Author(s) (published by Frontiers)

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Conditions

Accepted version:

Open Access Journal

Published version:

Open Access Journal

Remarks:

At Frontiers, the entire content of all present and past journals is immediately and permanently accessible online free of charge. Furthermore, all articles published in Frontiers are subject to an exclusive license agreement between the authors and Frontiers, so that readers are permitted unrestricted use, distribution, and reproduction in any medium, provided the original authors and the source are credited.

Under the Frontiers Terms and Conditions, authors retain the copyright to their work. All Frontiers articles are Open Access and distributed under the terms of the Creative Commons Attribution License, (CC-BY 3,0), which permits the use, distribution and reproduction of material from published articles, provided the original authors and source are credited, and subject to any copyright notices concerning any third-party content.

Verification Date:

 28.05.2013