- Correspondence to Dr Jennifer Zeitlin, Obstetrical, Perinatal and Paediatric Epidemiology Research Team, INSERM, Centre for Epidemiology and Biostatistics (U1153), EPOPé, Maternité de Port Royal, 53 avenue de l'Observatoire, Paris 75014, France;
- Received November 25, 2015
- Accepted December 1, 2015
- First published December 30, 2015.
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