1. Department of Pathology, Immunology, and Laboratory Medicine, Emerging Pathogens Institute, University of Florida, Gainesville, FL 32601, USA
2. Department of Biology, Temple University, Philadelphia, PA 19122, USA
3. Department of Biology, Boston College, Chestnut Hill, MA 02467, USA
4. Department of Retrovirology, Armed Forces Research Institute of Medical Sciences - United States Component, Bangkok 10400, Thailand
5. SEARCH, Thai Red Cross AIDS Research Center, Bangkok 10330, Thailand
6. U.S. Military HIV Research Program, Walter Reed Army Institute of Research, Rockville, MD 20850, USA
7. Division of Neurology, Department of Medicine, Phramongkutklao Hospital, Bangkok 10400, Thailand
8. Faculty of Medicine, Department of Radiology, Chulalongkorn University, Bangkok 10330, Thailand
9. Department of Neurology, University of California San Francisco, San Francisco, CA 94143, USA