1. Emory Health Services Research Center, Department of Medicine, Department of Surgery, Emory University School of Medicine, Atlanta, Georgia
2. Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, Georgia
3. Department of Emergency Medicine at Harbor-University of California, Los Angeles, David Geffen School of Medicine
4. Statistical Editor, JAMA Surgery
5. Department of Surgery, City of Hope Medical Center, Duarte, California