1 Department of Anatomy, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia
2 Department of Biomedical Science, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia
3 Nanotechnology & Catalysis Research Centre (NANOCAT), Block 3A, Institute of Postgraduate Studies Building, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia