About the Authors
Department of Medical Microbiology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia
The authors have declared that no competing interests exist.
Conceived and designed the experiments: MAA SDS. Performed the experiments: MAA SMW. Analyzed the data: MAA SMW SDS. Contributed reagents/materials/analysis tools: SDS. Wrote the paper: MAA SMW SDS.