1. Ageing and Age-Associated Disorders Research Group, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
2. Kulliyyah (Faculty) of Nursing, International Islamic University of Malaysia, Pahang, Malaysia
3. Department of Medicine, Faculty of Medicine, University of Malaya Kuala Lumpur, Malaysia
4. Department of Psychology, School of Medicine, International Medical University, Kuala Lumpur, Malaysia
5. Department of Nursing Science, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia