Funding for this research was provided by:
Centrum för idrottsforskning (P2019-0079, P2017-0111)
Stockholms Läns Landsting (SLL20150435)
Received: 30 September 2020
Accepted: 11 February 2021
First Online: 11 March 2021
Ethics approval and consent to participate
: This study was conducted with ethical approval from the Regional Ethical Review Committee in Stockholm, Sweden (ID nr. 2013/1791–31/3 and 2009/2079–31/2). All the subjects in the present study obtained informed consent and the study was approved by the Institutional Review Board.
: There is no financial or other relationship that may cause a conflict of interest.