1. From the Division of Research and Optimal Patient Care, American College of Surgeons, Chicago, IL (Liu, Ko, Hall, Cohen)
2. the Department of Surgery, University of California Los Angeles David Geffen School of Medicine and the VA Greater Los Angeles Healthcare System, Los Angeles, CA (Ko)
3. the Department of Surgery, Washington University in St. Louis; Center for Health Policy and the Olin Business School at Washington University in St Louis; John Cochran Veterans Affairs Medical Center; and BJC Healthcare, St Louis, MO (Hall).