1 Division of Research and Optimal Patient Care, American College of Surgeons, Chicago, IL; Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA. Electronic address: lhu@facs.org.
2 Division of Research and Optimal Patient Care, American College of Surgeons, Chicago, IL; Department of Surgery, Feinberg School of Medicine, Northwestern University, Chicago, IL.
3 Division of Research and Optimal Patient Care, American College of Surgeons, Chicago, IL; Department of Surgery, David Geffen School of Medicine at UCLA, Los Angeles, CA; VA Greater Los Angeles Healthcare System, Los Angeles, CA.