1. The Malaysian Elders Longitudinal Research (MELoR), University of Malaya, Kuala Lumpur, Malaysia
2. Centre of Excellence for Research in AIDS (CERiA), University of Malaya, Kuala Lumpur, Malaysia
3. Centre for Medical Psychology and Evidence-based Decision-making, Sydney School of Public Health, The University of Sydney, Sydney, Australia
4. Department of Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
5. Department of Pharmacy, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia