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Additional Information

Competing Interests

The author declares no conflicts of interests. The author works for Ng Ah Leng Polythene Trading.

Author Contributions

Wenfa Ng conceived and designed the experiments, performed the experiments, analyzed the data, prepared figures and/or tables, authored or reviewed drafts of the paper, approved the final draft.

Data Deposition

The following information was supplied regarding data availability:

Raw data are plotted as figures in the manuscript.

Funding

The author thank the National University of Singapore for financial support. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.


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