Funding for this research was provided by:
Vetenskapsrådet (2018-03135, 2015-02414)
Centrum för idrottsforskning (FO2018-0012)
Region Östergötland (LIO-527921, LIO-722051)
Received: 28 January 2020
Accepted: 28 October 2020
First Online: 23 November 2020
Ethics Approval and Consent to Participate
: The study was approved by the regional ethical review board in Linköping, Sweden: Dnr 2017/294-31. Players and their legal guardians received written information about the study and signed written informed consent forms before study commencement. They were informed that all data would be fully anonymised and that they cannot be identified via the paper.
: Not applicable—no individual person data is presented.
: The authors, Hanna Lindblom, Markus Waldén, and Martin Hägglund, declare that they have no competing interests.