title: Authors' reply to Page and Rafi.
authors: INSERM UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (Epopé), Center for Epidemiology and Statistics Sorbonne Paris Cité, DHU Risks in pregnancy, Paris Descartes University, Paris, 75014, France.
authors: Jennifer
authors: J
authors: Zeitlin
authors: Department of Health Sciences, University of Leicester, Leicester, UK.
authors: Bradley N
authors: BN
authors: Manktelow
authors: INSERM UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (Epopé), Center for Epidemiology and Statistics Sorbonne Paris Cité, DHU Risks in pregnancy, Paris Descartes University, Paris, 75014, France.
authors: Aurelie
authors: A
authors: Piedvache
authors: Clinical Care and Management Innovation Research Area, Bambino Gesù Children's Hospital, Rome, Italy.
authors: Marina
authors: M
authors: Cuttini
authors: Department of Health Sciences, University of Leicester, Leicester, UK.
authors: Elaine
authors: E
authors: Boyle
authors: Department of Neonatology, Radboud University Medical Centre, Nijmegen, Netherlands.
authors: Arno
authors: A
authors: van Heijst
authors: Department of Neonatology, Poznan University of Medical Sciences, Poznan, Poland.
authors: Janusz
authors: J
authors: Gadzinowski
authors: Department of Neonatology, Antwerp University Hospital, Antwerp; Study Centre for Perinatal Epidemiology, Flanders, Brussels, Belgium.
authors: Patrick
authors: P
authors: Van Reempts
authors: Department of Obstetrics, Hvidovre University Hospital, Hvidovre, Denmark.
authors: Lene
authors: L
authors: Huusom
authors: Department of Obstetrics, Hvidovre University Hospital, Hvidovre, Denmark.
authors: Tom
authors: T
authors: Weber
authors: Department of Obstetrics, University Hospital, Philipp University of Marburg, Germany.
authors: Stephan
authors: S
authors: Schmidt
authors: EPIUnit-Institute of Public Health, University of Porto, Porto, Portugal.
authors: Henrique
authors: H
authors: Barros
authors: Health Department, Regione Lazio, Rome, Italy.
authors: Dominico
authors: D
authors: Dillalo
authors: Unit of Neonates and Infants, Tallinn Children's Hospital, Tallinn, Estonia; University of Tartu, Tartu, Estonia.
authors: Liis
authors: L
authors: Toome
authors: Department of Clinical Science, Intervention and Technology, Division of Paediatrics, Karolinska Institute, Stockholm, Sweden; Department of Neonatal Medicine, Karolinska University Hospital, Stockholm, Sweden.
authors: Mikael
authors: M
authors: Norman
authors: INSERM UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (Epopé), Center for Epidemiology and Statistics Sorbonne Paris Cité, DHU Risks in pregnancy, Paris Descartes University, Paris, 75014, France.
authors: Beatrice
authors: B
authors: Blondel
authors: INSERM UMR 1153, Obstetrical, Perinatal and Pediatric Epidemiology Research Team (Epopé), Center for Epidemiology and Statistics Sorbonne Paris Cité, DHU Risks in pregnancy, Paris Descartes University, Paris, 75014, France.
authors: Mercedes
authors: M
authors: Bonet
authors: Department of Health Sciences, University of Leicester, Leicester, UK.
authors: Elisabeth S
authors: ES
authors: Draper
authors: Children's Hospital, University Hospital, Philipp University of Marburg, Germany.
authors: Rolf F
authors: RF
authors: Maier