BJOG Exchange Jennifer Zeitlin, Corresponding Author jennifer.zeitlin@inserm.fr orcid.org/0000-0002-9568-2969 Obstetrical Perinatal and Paediatric Epidemiology Research Team, EPOPé, INSERM, INRA, Université de Paris, CRESS, Paris, F-75004 France Search for more papers by this author Mélanie Durox, Obstetrical Perinatal and Paediatric Epidemiology Research Team, EPOPé, INSERM, INRA, Université de Paris, CRESS, Paris, F-75004 France Search for more papers by this author Alison Macfarlane,...