1. Department of Surgery, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR
2. Department of Surgery, Northwestern University Feinberg School of Medicine, Chicago, Il.
3. Qsource, Little Rock, AR
4. Division of Pediatric Surgery and Section of Pediatric Critical Care Medicine, Department of Surgery, University of Arkansas College of Medicine and Arkansas Children's Hospital, Little Rock, AR
5. Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR