1. Department of Medicine, Faculty of Medicine, University Malaya Medical Center, Lembah Pantai, Kuala Lumpur, Malaysia
2. Department of Psychological Medicine, Faculty of Medicine, University Malaya Medical Center, Kuala Lumpur, Malaysia
3. Department of Nursing Science, Faculty of Medicine, University Malaya Medical Center, Kuala Lumpur, Malaysia
4. Department of Social and Preventive Medicine, Faculty of Medicine, University Malaya Medical Center, Kuala Lumpur, Malaysia