1. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27516, USA
2. Department of Computer Science, University of Maryland, College Park, MD 20742, USA
3. Center for Bioinformatics and Computational Biology, University of Maryland, College Park, MD 20742, USA
4. New York Genome Center, New York, NY 10013, USA
5. Center for Genomics and Systems Biology, New York University, New York, NY 10003, USA
6. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
7. Department of Genetics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27514, USA