1. 1Department of Surgery, University of California San Francisco, San Francisco, California.
2. 2University of California San Francisco School of Medicine, San Francisco, California.
3. 3Department of Radiology, University of California San Francisco, San Francisco, California.
4. 4Harvard Medical School, Boston, Massachusetts.
5. 5Quinnipiac University School of Medicine, North Haven, Connecticut.
6. 6Department of Surgery, Duke University, Durham, North Carolina.
7. 7Department of Medicine, University of California San Francisco, San Francisco, California.
8. 8Department of Pathology, University of California Davis, Sacramento, California.