- Correspondence to Dr Isabelle Stücker, CESP Centre for Research in Epidemiology and Population Health, 16 avenue Paul Vaillant Couturier, Villejuif, Cedex 94807, France;
- Received February 21, 2014
- Revised June 4, 2014
- Accepted June 18, 2014
- First published July 11, 2014.
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