Open Access. The Published version of this work has been reproduced here in accordance with the Publisher’s self archiving and copyright policies.
Rights
This work was published in BioPsychoSocial Medicine 1 (2) 2007 p. [1-14] and has be reproduced here under the Creative Commons Attribution License http://creativecommons.org/licenses/by/2.0/ All works published by BioMed Central are under the terms of the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.