Brief summary of what Open Access means for the reader:

  Articles with this logo are immediately and permanently available online. Unrestricted use, distribution and reproduction in any medium is permitted, provided the article is properly cited. See our open access charter.

Anyone is free:

• to copy, distribute, and display the work;
• to make derivative works;
• to make commercial use of the work;

Under the following conditions: Attribution

• the original author must be given credit;
• for any reuse or distribution, it must be made clear to others what the license terms of this work are;
• any of these conditions can be waived if the authors gives permission.

Statutory fair use and other rights are in no way affected by the above.