1. Department of Medicine, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia (UPM), Serdang, 43400 Selangor, Malaysia
2. Department of Chemistry, International Medical University, 57000 Kuala Lumpur, Federal Territory of Kuala Lumpur, Malaysia
3. Centre for Research and Graduate Studies, University of Cyberjaya, Persiaran Bestari, 63000 Cyberjaya, Selangor, Malaysia