Open access peer-reviewed chapter
By Agnieszka Rak-Mardyła, Anna Ptak and Ewa Łucja Gregoraszczuk
Submitted: May 18th 2011Reviewed: October 11th 2011Published: April 27th 2012
© 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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