[1
]Department of Anesthesiology, University of Malaya, Kuala Lumpur, Malaysia
[2
]Department of Pharmacology, University of Malaya, Kuala Lumpur, Malaysia
[3
]Department of Medical Microbiology, University of Malaya, Kuala Lumpur, Malaysia
[4
]Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala
Lumpur, Malaysia