1. Department of Surgery, UT Southwestern Medical Center, Parkland Memorial Hospital, Dallas, Texas.
2. Division of Burns/Trauma/Critical Care, Department of Surgery, UT Southwestern Medical Center, Parkland Memorial Hospital, Dallas, Texas.
3. Division of Biostatistics, Department of Clinical Sciences, UT Southwestern Medical Center, Dallas, Texas.
4. Department of Neurological Surgery, UT Southwestern Medical Center, Parkland Memorial Hospital, Dallas, Texas.