Participants and intervention
The Regional Ethical Review Board at the University of Gothenburg approved the study (Dnr 303–11, T570–15). The study was performed following theethical standards of the Helsinki Declaration of 1975, as revised in 1983. Informed signed consent for all participants was obtained from parents or legal guardians. Infants were recruited between December 2016 and August 2019 at three centers in Sweden: Queen Silvia Children’s Hospital in Göteborg, Skåne University Hospital in Lund, and Karolinska University Hospital in Stockholm [