1. Stanford University School of Medicine, Stanford, California
2. Division of Trauma and Acute Care Surgery, Department of Surgery, Los Angeles County and USC Medical Center, Los Angeles, California
3. Stanford Center for Biomedical Ethics, Department of Medicine, Stanford University, Stanford, California
4. Surgical Service, Palo Alto Veterans Health Care System, Palo Alto, California
5. Department of Surgery, Stanford University School of Medicine, Stanford, California