1. Department of Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia;
2. Centre of Excellence for Research in AIDS (CERiA), University of Malaya, Kuala Lumpur, Malaysia;
3. AIDS Program, Yale School of Medicine, New Haven, CT;
4. Department of Biostatistics and Epidemiology, School of Public Health, University of North Texas Health Science Center, Fort Worth, TX; and
5. Department of Primary Care Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.