Gerdner, Arne http://orcid.org/0000-0002-8158-0486
Håkansson, Anders http://orcid.org/0000-0002-5800-8975
Article History
Received: 1 April 2022
Accepted: 18 August 2022
First Online: 6 September 2022
Declarations
:
: Adolescents participated voluntarily in a longitudinal research programme with parental consent, after receiving comprehensive information translated into the language spoken at home, in all 32 languages. If parents did not opt out on behalf of their child, he or she was given the choice to participate or to opt out of the whole programme. In this way informed consent was obtained from all subjects and their legal guardians. The adolescents were also free to participate or abstain from participation in each data collection. The research programme and data collection details were approved by the Regional Research Review Board in Gothenburg (No. 362–13; 2013–09-25) and with amendments approved for Wave 2 (2014–05-20), Waves 3–4 (2015–09-02), Wave 5 (2017–07-25) and Wave 6 (2018–07-26). All methods were carried out in in accordance with relevant guidelines and regulations. The study did not carry out any experiment.
: Not applicable. No individual data are published.
: AH has a position at Lund University which is supported by the state-owned gambling operator of Sweden, Svenska Spel. He also has obtained research funding from Svenska Spel’s research council. Both authors AH and AG had previous funding from the research council of the Swedish state-owned retail monopoly of alcohol, Systembolaget. None of these organisations had any role in the present research.