1. Children’s National Hospital, George Washington University School of Medicine and Health Sciences, Division of Emergency Medicine and Trauma Center, Washington, District of Columbia
2. Los Angeles County Emergency Medical Services Agency, Harbor-UCLA Medical Center, David Geffen School of Medicine at UCLA, Department of Emergency Medicine, Los Angeles, California
3. Children’s Hospital at LHSC, Department of Pediatrics and Medicine, Schulich School of Medicine & Dentistry-Western University, London, Ontario, Canada