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Authors
Graff-Iversen, Sidsel http://orcid.org/0000-0002-7044-8228
Hewitt, Stephen
Forsén, Lisa
Grøtvedt, Liv
Ariansen, Inger
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Article History
Received: 22 January 2019
Accepted: 21 October 2019
First Online: 1 November 2019
Ethics approval and consent to participate
: All survey participants have given a written consent for use of their data in research. Concession for research by use of data from the National Health surveys was given by the Norwegian Data Inspctorate by October 13th 2003 and prolonged in January 28th 2010.
: All tables and figures are based on survey data according to consent and concession mentioned above.
: None of the authors have any competing interest in relation to this research.
