1. Malaysian Research Institute on Ageing, Universiti Putra Malaysia, Serdang, Malaysia.
2. Department of Biomedical Science, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia.
3. Department of Ophthalmology, Universiti Kebangsaan Malaysia Medical Centre, Cheras, Malaysia.
4. Department of Nutrition and Dietetics, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia.
5. Department of Ophthalmology, Hospital Selayang, Batu Caves, Malaysia.
6. Department of Family Medicine, Universiti Putra Malaysia, Serdang, Malaysia.
7. Department of Medicine, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Malaysia.