Open access peer-reviewed chapter
By Lise Herslund and Hanne Tanvig
Submitted: March 18th 2011Reviewed: August 4th 2011Published: April 20th 2012
DOI: 10.5772/30458
Downloaded: 1869
© 2012 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution 3.0 License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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