Funding for this research was provided by:
Helse- og Omsorgsdepartementet (NO1-ES-75558)
Norges Forskningsråd (151918/S10)
Helse Sør-Øst RHF (NO1-ES-75558)
Universitetet i Oslo
Norwegian Ministry of Education and Research (1 UO1 NS 047537-01)
The Norwegian SIDS and Stillbirth Society (1 UO1 NS 047537-01)
Received: 15 August 2016
Accepted: 11 January 2018
First Online: 24 January 2018
Ethics approval and consent to participate
: Informed written consent was obtained for all participants upon recruitment. MoBa has obtained a license from the Norwegian Data Protection Authority. This sub-study was approved by The Regional Committee for Medical Research Ethics in South-Eastern Norway (date of approval 28.10.13, reference no 1525).
: Not applicable.
: The authors declare that they have no competing interests.
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