1. Department of Emergency Medicine; University of Alabama School of Medicine; Birmingham Alabama USA.
2. Department of Epidemiology, School of Public Health; University of Alabama; Birmingham Alabama USA
3. Department of Biostatistics, School of Public Health; University of Alabama; Birmingham Alabama USA
4. Department of Emergency Medicine; Beth Israel Deaconess Medical Center; Boston Massachusetts USA
5. Division of Preventive Medicine, Department of Medicine; University of Alabama School of Medicine; Birmingham Alabama USA