Institution: | 1. The National Registry of Emergency Medical Technicians, Columbus, Ohio;2. Carolinas Medical Center, The Center for Prehospital Medicine, Charlotte, North Carolina;3. Division of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, Ohio;4. Division of Epidemiology, College of Public Health, The Ohio State University, Columbus, Ohio;5. Division of Biostatistics, College of Public Health, The Ohio State University, Columbus, Ohio |