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Article History

Received: 7 February 2023

Accepted: 13 December 2023

First Online: 6 January 2024

Declarations

:

: All methods were carried out in accordance with relevant guidelines and regulations. Ethical approval was obtained from the Regional Ethics Review Board, Linköping University, Linköping, Sweden (Reference Number 2010/267 − 31, with two amendments: 2013/286 − 32 and 2015/146 − 32). All participants gave informed consent in writing before inclusion and could withdraw at any time. In line with the decision from the ethics review board and with Swedish law (The Act concerning the Ethical Review of Research Involving Humans (2003:460)), research subjects aged 15 to 18 years could consent on their own, without the involvement of a parent or legal guardian. Personal information was treated confidentially.

: Not applicable.

: The authors declare no competing interests.