1. Department of Surgery, University of California, Irvine Medical Center, Orange, California.
2. Department of Surgery, University of California, San Francisco East Bay, San Francisco, California.
3. Legacy Emanuel Medical Center, Portland, Oregon.
4. Department of Anesthesiology, University of Southern California, Los Angeles, California.
5. Reference Department, University of California-Irvine Libraries, NS, University of California, Irvine, Irvine, California.
6. Center for Statistical Consulting, University of California, Irvine, Irvine, California.
7. Department of Surgery, Weill Cornell Medical College at New York/Presbyterian Hospital, New York, New York.