1 College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
2 Department of Surgery, Division of Trauma and Acute Care Surgery, University of Arkansas for Medical Sciences, Little Rock, AR, USA.
3 Metropolitan Emergency Medical Services, Little Rock, AR, USA.
4 Department of Surgery, Division of Trauma and Acute Care Surgery, University of Arkansas for Medical Sciences, Little Rock, AR, USA. Electronic address: kevin.sexton@uams.edu.