Open access peer-reviewed chapter
By Torbjörn Backman, Malin Mellberg, Helén Sjöwie, Magnus Anderberg and Einar Arnbjörnsson
Submitted: November 11th 2010Reviewed: April 6th 2011Published: December 2nd 2011
DOI: 10.5772/21193
Downloaded: 2109
© 2011 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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