- Correspondence to Dr Orianne Dumas, Respiratory and environmental Epidemiology, CESP/U 1018 Inserm, 16, avenue Paul Vaillant Couturier, Villejuif, Cedex 94807, France;
- Received January 7, 2013
- Revised April 11, 2013
- Accepted May 16, 2013
- First published June 12, 2013.
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