About the Authors

Lei Yong Lee

Affiliation School of Mathematical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Michael Boon Chong Khoo

mkbc@usm.my

Affiliation School of Mathematical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia

Sin Yin Teh

Affiliation School of Management, Universiti Sains Malaysia, 11800 Penang, Malaysia

Ming Ha Lee

Affiliation School of Engineering, Computing and Science, Swinburne University of Technology (Sarawak Campus), Sarawak, Malaysia

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Conceived and designed the experiments: LYL MBCK. Performed the experiments: LYL MBCK. Analyzed the data: LYL MBCK. Contributed reagents/materials/analysis tools: LYL MBCK SYT MHL. Wrote the paper: LYL MBCK SYT MHL.