1. Center for Bioinformatics and Computational Biology, University of Maryland, College Park, MD 20742, USA
2. Genome Center, University of California, Davis, CA 95616, USA
3. Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, KS 66045, USA
4. Department of Scientific Computing, Florida State University, Tallahassee, FL 32306, USA
5. Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269, USA
6. Department of Integrative Biology, University of California, Berkeley, CA 94720, USA
7. Swedish Museum of Natural History, 114 18 Stockholm, Sweden
8. Center for Evolutionary Genomics, Institute for Genome Sciences & Policy, Duke University, Durham, NC 27708, USA
9. Institute of Evolutionary Biology, University of Edinburgh, Edinburgh EH9 3JT, UK; E-mail: a.rambaut@ed.ac.uk
10. Fogarty International Center, National Institutes of Health, Bethesda, MD 20892, USA
11. Department of Biomathematics
12. Department of Biostatistics
13. Department of Human Genetics, University of California, Los Angeles, CA 90095, USA; E-mail: msuchard@ucla.edu