- Correspondence to Dr Soumaya Ben Khedher, CESP Centre for Research in Epidemiology and Population Health 16 avenue Paul Vaillant Couturier, 94807 Villejuif Cedex, France;
- Received September 28, 2016
- Revised April 6, 2017
- Accepted April 13, 2017
- First published May 10, 2017.
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