1. Dan L. Duncan Comprehensive Cancer Center Division of Biostatistics, Baylor College of Medicine, Houston, TX, USA
2. Department of Medicine, Baylor College of Medicine, Houston, TX, USA
3. Human Genome Sequencing Center, Baylor College of Medicine, Houston, TX, USA
4. Department of Bioinformatics and Computational Biology, The University of Texas MD Anderson Cancer Center, Houston, TX, USA