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History
- Received May 30, 2015
- Revision received October 16, 2015
- Accepted October 20, 2015
- Published online November 1, 2015.
Copyright & Usage
Copyright © 2015 Södersten This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International, which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.
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Author contributions
↵2 Author contributions: P.S. wrote the paper.
Disclosures
↵1 The author declares no competing financial interests.
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