Received: 26 October 2020
Accepted: 28 February 2021
First Online: 15 March 2021
: The trial from which data for this secondary analysis was used, was performed in accordance with the Declaration of Helsinki. The Norwegian Regional Committee for Medical Research Ethics South-East-C approved the overall study and modifications (REK reference 2009/429). Signed, informed consent was obtained from all participating women on behalf of themselves and their child. The NFFD trial was registered in ClinicalTrials.gov ID NCT01001689.
: Not applicable.
: The authors declare that they have no competing interests.