- Correspondence to Julie Perlbarg, Obstetrical, Perinatal and Pediatric Epidemiology Team, Epidemiology and Statistics, Sorbonne Paris Cité Research Center (U1153), Inserm, 4, rue de la Chine, 75020 Paris, France;
- Received April 4, 2015
- Revised December 15, 2015
- Accepted January 6, 2016
- First published February 2, 2016.
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