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Additional Information

Competing Interests

The authors declare that they have no competing interests.

Author Contributions

Kamariah Ibrahim conceived and designed the experiments, performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, wrote the paper, prepared figures and/or tables.

Abubakar Danjuma performed the experiments, analyzed the data, contributed reagents/materials/analysis tools, prepared figures and/or tables.

Chyan Leong Ng reviewed drafts of the paper.

Nor Azian Abdul Murad reviewed drafts of the paper.

Roslan Harun conceived and designed the experiments, reviewed drafts of the paper.

Wan Zurinah Wan Ngah reviewed drafts of the paper.

Rahman Jamal reviewed drafts of the paper.

Data Deposition

The following information was supplied regarding data availability:

The research in this article did not generate any raw data.

Funding

This study was funded by the Higher Institution Centre of Excellence (HICOE) research grant (JJ-015-2011), Ministry of Education, Malaysia. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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