1. Department of Surgery, University of Texas Southwestern Medical Center, Dallas2Department of Surgery, North Texas Veterans Administration Healthcare System, Dallas
2. Department of Surgery, University of Texas Southwestern Medical Center, Dallas
3. University of Texas Southwestern Medical Center Library, Dallas
4. Departments of Epidemiology and Biostatistics, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Department of Surgery, University of Texas Southwestern Medical Center, Dallas2Department of Surgery, North Texas Veterans Administration Healthcare System, Dallas5Department of Biomedical Engineering, University of Texas–Arlington, Arlington6Deputy Edito