- 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 25 November 2015
- Accepted 1 December 2015
- Published online 30 December 2015.
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