1. Department of Surgery, Northwestern Quality Improvement, Research & Education in Surgery (NQUIRES) Northwestern Medicine Chicago Illinois USA
2. Division of Research and Optimal Patient Care American College of Surgeons Chicago Illinois USA
3. Department of Neurology, Biological Sciences Division The University of Chicago Chicago Illinois USA
4. Department of Surgery Indiana University School of Medicine Indianapolis Indiana USA
5. Mathematica Chicago Illinois USA
6. Surgical Service Jesse Brown VA Medical Center Chicago Illinois USA
7. Department of Medical Social Sciences Northwestern University Feinberg School of Medicine Chicago Illinois USA
8. Department of Surgery, Biological Sciences Division The University of Chicago Chicago Illinois USA