1. Rega Institute for Medical Research, KULeuven, Leuven, Belgium
2. Molecular Virology and Bioinformatics Unit, Africa Centre, Nelson Mandela School of Medicine, Durban, South Africa
3. Laboratoire Retrovirus, IRD, Montpellier, France
4. Linnaeus Center for Bioinformatics, Uppsala University, Uppsala, Sweden
5. Allan Wilson Centre for Molecular Ecology and Evolution, Massey University, Palmerston North, New Zealand
6. Human Immunodeficiency Virus and Retrovirology Branch, Division of AIDS, Sexually Transmitted Diseases, and Tuberculosis, Centers for Disease Control and Prevention, Atlanta, Georgia