- Correspondence to Dr Arnaud Fontanet, Unité d'Epidémiologie des Maladies Emergentes – Institut Pasteur, 25 Rue du Docteur Roux – Bâtiment Laveran 3ème étage – 75724 Paris Cedex 15, France;
- Revised June 16, 2010
- Accepted July 15, 2010
- First published October 14, 2010.
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