Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.|Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA.|Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.|Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC, USA.|Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA.|Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.|Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA.|Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.|Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.|Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.|Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.|Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC, USA.