1. Department of Surgery, University of California, Irvine, CA, USA
2. Department of Surgery, University of Southern California, Los Angeles, CA, USA
3. Department of Surgery, Cedars-Sinai Medical Center, Los Angeles, CA, USA
4. Department of Surgery, University of California, Los Angeles, CA, USA
5. Department of Surgery, Loma Linda University, Loma Linda, CA, USA
6. Riverside/Riverside University Health System Department of Surgery, University of California, Moreno Valley, CA, USA
7. Riverside University Health System, Comparative Effectiveness and Clinical Outcomes Research Center (CECORC), Moreno Valley, CA, USA
8. Department of Surgery, University of California, San Diego, CA, USA
9. Department of Surgery, Sharp Memorial Hospital, San Diego, CA, USA
10. Trauma Department, Scripps Memorial Hospital La Jolla, La Jolla, CA, USA
11. Department of Surgery, Ventura County Medical Center, Ventura, CA, USA
12. Department of Trauma, Santa Barbara Cottage Hospital, Cottage Health Research Institute, Santa Barbara, CA, USA