1. Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
2. Centre of Excellence for Research in AIDS (CERiA), Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
3. National Blood Centre of Kuala Lumpur (NBCKL), Kuala Lumpur, Malaysia
4. Division of Genetics and Molecular Biology, Institute of Biological Sciences, Faculty of Science, University of Malaya, Kuala Lumpur, Malaysia
5. Blood Systems Research Institute (BSRI), San Francisco, California, USA
6. Department of Laboratory Medicine, University of California, San Francisco, San Francisco, California, USA
7. AIDS Research Center, National Institute of Infectious Diseases, Toyama, Tokyo, Japan