- Correspondence to Dr Hermann Nabi, Centre for Research in Epidemiology and Population Health /U1018, Hôpital, Paul Brousse, Bâtiment 15/16, 16 avenue Paul Vaillant Couturier 94807 Villejuif Cedex, France;
- Accepted June 15, 2010
- First published September 15, 2010.
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