Funding for this research was provided by:
Volvo Research and Educational Foundations (H92:37)
Received: 15 August 2020
Accepted: 21 October 2020
First Online: 30 October 2020
Ethics approval and consent to participate
: The Research Ethics Committee of Gothenburg University approved the original study protocol and the consent to participate form on 11 February 1993 (Dnr 23-93). The Research Ethics Committee of Gothenburg University renewed their approval of a changes study protocol on 19 February 2019 (Dnr1212-18/2019-00316). For the present study, the need to consent was waivered by the ethics committee since only registered information was collected and anonymized.
: Not applicable.