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Authors
Gravdal, Brit Helene
Lönnberg, Stefan
Skare, Gry Baadstrand
Sulo, Gerhard
Bjørge, Tone http://orcid.org/0000-0002-9096-5257
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Article History
Received: 27 October 2019
Accepted: 24 February 2021
First Online: 18 March 2021
Declarations
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: The study and the researchers were approved by the Regional Committee for Medical and Health Research Ethics of Western Norway (REK ref. number 2014/1918). We also obtained permission to use the data from the data owners.
: Not applicable.
: The authors declare no conflicts of interest.
