1. Department of Emergency MedicineBrigham and Women's Hospital and Harvard Medical School Boston Massachusetts USA
2. Department of Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep MedicineUniversity of Arizona Tucson Arizona USA
3. Department of Emergency MedicineUniversity of Arizona Tucson Arizona USA
4. Department of Emergency MedicineAllegheny Health Network Erie Pennsylvania USA
5. Department of Emergency MedicineCarolinas Medical Center Charlotte North Carolina USA