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Authors
Rosenström, Tom https://orcid.org/0000-0001-8277-3776
Czajkowski, Nikolai Olavi
Ystrom, Eivind
Krueger, Robert F.
Aggen, Steven H.
Gillespie, Nathan A.
Eilertsen, Espen
Reichborn-Kjennerud, Ted
Torvik, Fartein Ask
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Funding
Funding for this research was provided by:
National Institute on Drug Abuse (1R01DA037558-01A1)
Norges Forskningsråd (226985, 240061)
Fifth Framework Programme (QLG2-CT-2002-01254)
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Article History
Received: 25 January 2018
Accepted: 27 November 2018
First Online: 7 December 2018
Compliance with ethical standards
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: Tom Rosenström, Nikolai Czajkowski, Eivind Ystrom, Robert Krueger, Steven Aggen, Nathan Gillespie, Espen Eilertsen, Ted Reichborn-Kjennerud, and Fartein Torvik declare that they have no conflict of interest.
: Approval was received from The Norwegian Data Inspectorate and the Regional Committee for Medical and Health Research Ethics.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: A written informed consent was obtained from all participants after a complete description of the study.
