1. School of Medical Sciences, Universiti Sains Malaysia, Kubang Kerian, 16150 Kelantan, Malaysia
2. School of Health Sciences, Universiti Sains Malaysia, Kubang Kerian, 16150 Kelantan, Malaysia
3. Department of Medicine, Universiti Kebangsaan Malaysia, Kuala Lumpur, 56000 Cheras, Malaysia
4. Institute for Medical Research, 50588 Kuala Lumpur, Malaysia