1. Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA 94305, USA.
2. Department of Radiation Oncology, University of California, San Francisco, CA 94143, USA.
3. Department of Radiology, Massachusetts General Hospital, Boston, MA 02114, USA.
4. Université de Moncton, Moncton, New Brunswick E1A 3E9, Canada.
5. Institute for Genome Sciences and Policy, Department of Molecular Genetics and Microbiology, Duke Medical Center, Durham, NC 27708, USA.
6. High-Throughput Bioscience Center, Stanford University School of Medicine, Stanford, CA 94305, USA.
7. Auckland Cancer Society Research Centre, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
8. Department of Comparative Medicine, Stanford University School of Medicine, Stanford, CA 94305, USA.