1 Department of Emergency Medicine, Christchurch Hospital, Christchurch, New Zealand. martin@thanstedman.onmicrosoft.com.
2 Department of Medicine, University of Otago, Christchurch, New Zealand. martin@thanstedman.onmicrosoft.com.
3 Department of Emergency Medicine, University of Kansas Medical Center, The University of Kansas Health System, Kansas City, KS, USA. martin@thanstedman.onmicrosoft.com.
4 Henry JN Taub Department of Emergency Medicine, Baylor College of Medicine, Houston, TX, USA.
5 Department of Emergency Medicine, University of Kansas Medical Center, The University of Kansas Health System, Kansas City, KS, USA.