1. Center for Engineering in Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
2. Shriners Hospital for Children, Harvard Medical School, Boston, MA 02114, USA.
3. Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
4. Massachusetts General Hospital Cancer Center, Harvard Medical School, Boston, MA 02114, USA.
5. Department of Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
6. Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
7. Department of Urology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
8. Department of Pathology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.