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Authors
Lund, Marianne http://orcid.org/0000-0002-9737-3879
Lund, Ingeborg http://orcid.org/0000-0002-5066-9525
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Article History
Received: 8 November 2021
Accepted: 18 March 2022
First Online: 31 March 2022
Declarations
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: Statistics Norway ensured that informed consent was obtained from all participants. The surveys from Statistics Norway are conducted in accordance with the Personal Data Act and the Statistics Act. The data were used with permission from Statistics Norway, and anonymised data files were made available to the authors. Both authors have signed a declaration of confidentially as requested by Statistics Norway. Data on tobacco use is not defined as medical and health research, and is therefore outside the remit of the National Research Ethics Committee for Medicine and Health Science. All methods were carried out in accordance with relevant guidelines and regulations.
: Not applicable.
: The authors declare no competing interests.
