- Correspondence to Professor Karine Gallopel-Morvan, Ecole des Hautes Etudes en Santé Publique (French School of Public Health), CREM (Centre de Recherche en Economie et Management), Av. du Professeur Léon-Bernard, CS 74312, Rennes Cx 35043, France;
- Received June 5, 2011
- Accepted September 7, 2011
- First published October 13, 2011.
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