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Authors
Helgadóttir, Björg
Fröberg, Andreas
Kjellenberg, Karin
Ekblom, Örjan
Nyberg, Gisela
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Funding
Funding for this research was provided by:
The knowledge foundation KKS (20180040, 20180040, 20180040, 20180040)
Skandia Mutual Life Insurance Company
Folkhälsomyndigheten
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Article History
Received: 24 August 2022
Accepted: 15 February 2023
First Online: 23 February 2023
Declarations
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: The study was approved by the Swedish Ethical Review Authority (dnr: 2019–03579 and 2021–01235) and was conducted according to the Helsinki Declaration. The Swedish Ethical Review Authority is the name of the ethical committee in Sweden and this is the authority that judges all ethical applications for research studies. More information in English on the Swedish Ethical Review Authority can be found here: . Students and their guardians gave written informed consent. Participants received ~ 45 USD in total for participating.
: Not applicable.
: The authors declare that they have no competing interests.
