1. Department of Emergency Medicine Stanford University School of Medicine Palo Alto California USA
2. Berbee Walsh Department of Emergency Medicine University of Wisconsin Madison Wisconsin USA
3. Department of Emergency Medicine, Northwestern University Feinberg School of Medicine McGaw Medical Center at Northwestern University Chicago Illinois USA
4. Department of Emergency Medicine University of Pennsylvania Perelman School of Medicine Philadelphia Pennsylvania USA
5. Department of Emergency Medicine Vanderbilt University Medical Center Nashville Tennessee USA
6. Department of Emergency Medicine Oregon Health & Science University Portland Oregon USA