Funding for this research was provided by:
Received: 19 February 2021
Accepted: 28 July 2021
First Online: 21 August 2021
: Ethical approval was obtained from the Swedish Ethical Review Authority (dnr 2019-05803).
: Not required
: One author, JL, is the owner of the private medical services company contracted as a medical team at the racetrack studied. The other authors, Karin Hugelius, Linda Ekh and Per Örtenwall, declare that they have no competing interests.