1. Center for Trauma and Critical Care, Department of Surgery, George Washington University, Washington, DC, USA
2. Department of Surgery, East Carolina University Brody School of Medicine, Greenville, NC
3. Division of Trauma, Emergency General Surgery, and Surgical Critical Care, Departments of Surgery, Neurosurgery, and Hearing and Speech Sciences, Section of Surgical Sciences, Vanderbilt Brain Institute, Vanderbilt Center for Health Services Research, Vanderbilt University Medical Center; Surgical Service, General Surgery Section, Nashville VA, Medical Center, Tennessee Valley Healthcare System, US Department of Veterans Affairs, Nashville, TN
4. Department of Surgery, San Antonio Military Medical Center, Fort Sam Houston, TX
5. Department of Surgery, Carle Foundation Hospital, Urbana, IL
6. Department of Surgery, University of North Carolina At Chapel Hill, Chapel Hill, NC
7. Department of Surgery, Medical Center at Plano, Plano, TX
8. Department of Surgery, Medical Center of The Rockies, Loveland, CO