Funding for this research was provided by:
Centrum for Idrottsforskning (P2018-0167)
Text and Data Mining valid from 2019-08-07
Received: 28 January 2019
Accepted: 29 July 2019
First Online: 7 August 2019
Ethics Approval and Consent to Participate
: The regional ethical review board in Linköping granted ethics approval for this study (Dnr: 2017/109-31), and consent was obtained from all players and their legal guardians. The study was performed in accordance with the standards of ethics outlined in the Declaration of Helsinki.
: Not applicable
: The authors, Gustav Ljunggren, Nirmala Kanthi Panagodage Perera Perera, and Martin Hägglund, declare that they have no competing interests.