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Authors
Marstein, Henriette Schermacher https://orcid.org/0000-0003-3490-5601
Godang, Kristin
Flatø, Berit
Sjaastad, Ivar
Bollerslev, Jens
Sanner, Helga
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Article History
Received: 13 November 2020
Accepted: 14 April 2021
First Online: 26 April 2021
Declarations
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: According to the declaration of Helsinki, written informed consent was obtained from all patients - parents if the patients were aged <16y - and controls. The study was approved by the Regional Ethics Committee of Medical Research (S-05144).
: Not applicable.
: The authors declare that they have no competing interests.
