- Correspondence to Dr Stéphanie Debette, Service d’Epidémiologie et Santé Publique; Inserm U744, 1, rue du Professeur Calmette, BP 245-59019 Lille Cedex, France;
- Received June 4, 2009
- Revised June 15, 2009
- Accepted June 16, 2009
- First published October 28, 2009.
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