1. Ludwig Center for Cancer Genetics and Howard Hughes Medical Institutions, Johns Hopkins Kimmel Cancer Center, Baltimore, MD 21287, USA.
2. Translational Genomics Research Institute, Phoenix, AZ 85044, USA.
3. Baylor Sammons Cancer Center, Texas Oncology, US Oncology, Dallas, TX 75246, USA.
4. Department of Biostatistics and Computational Biology, Dana-Farber Cancer Institute, Boston, MA 02215, USA.
5. Department of Biostatistics, Harvard School of Public Health, Boston, MA 02115, USA.