1. Department of Veterinary Integrative Biosciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, Texas, USA
2. Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina, USA
3. Department of Genetics, University of North Carolina, Chapel Hill, North Carolina, USA
4. Department of Human Genetics, University of Chicago, Chicago, Illinois, USA
5. Department of Pediatrics, Duke Center for Genomic and Computational Biology, Duke University, Durham, North Carolina, USA
6. Department of Biology, University of North Carolina, Chapel Hill, North Carolina, USA
7. UNC Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, North Carolina, USA