Received: 23 July 2019
Accepted: 25 November 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: The EPIPAGE-2 study was approved by the National Data Protection Authority (CNIL no. 911009) and by appropriate ethics committees (Consultative Committee on the Treatment of Data on Personal Health for Research Purposes – reference no. 10.626, Committee for the Protection of People Participating in Biomedical Research – reference CPP SC-2873). As this was an observational study with no interventions, and with approval from all three committees, implicit consent for participation was obtained: parents were given a detailed explanation (including explanatory leaflet) about the study and data were included unless the parents actively opted-out. We followed STROBE guidelines for reporting (Additional file InternalRef removed) [CitationRef removed].
: Not applicable.
: The authors declare that they have no competing interests.