1. Department of Emergency Medicine; Brigham and Women's Hospital; Boston Massachusetts USA
2. Department of Emergency Medicine; Maine Medical Center; Portland Maine USA
3. Department of Emergency Medicine; Massachusetts General Hospital; Boston Massachusetts USA
4. Department of Emergency Medicine; Boston Medical Center; Boston Massachusetts USA
5. University Teaching Hospital of Kigali (CHUK); Kigali Rwanda
6. Department of Emergency Medicine; Hospital of the University of Pennsylvania; Philadelphia Pennsylvania USA