1. Emergency Department, Lausanne University Hospital, University of Lausanne, Lausanne, Switzerland.
2. University of Lausanne, Lausanne, Switzerland.
3. Department of Anaesthesiology, University Hospital of Geneva, Geneva, Switzerland.
4. Department of Emergency Medicine, Stanford University Medical Center, Stanford, California, USA.
5. Emergency Service, Hôpital du Valais, Sion, Switzerland.
6. Institute of Social and Preventive Medicine, Lausanne University Hospital, Lausanne, Switzerland.