- Mrs R Nadif, Institut National de la Santé et de la Recherche Médicale, Recherche en Epidémiologie et Biostatistique U780-IFR69, 16 avenue Paul Vaillant Couturier, 94807 Villejuif cedex, France;
- Received June 17, 2008
- Accepted November 30, 2008
- First published January 8, 2009.
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