About the Authors

Jeffrey Chu

Affiliation School of Mathematics, University of Manchester, Manchester M13 9PL, United Kingdom

Saralees Nadarajah

mbbsssn2@manchester.ac.uk

Affiliation School of Mathematics, University of Manchester, Manchester M13 9PL, United Kingdom

Stephen Chan

Affiliation School of Mathematics, University of Manchester, Manchester M13 9PL, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: JC SN SC. Contributed reagents/materials/analysis tools: JC SN SC. Wrote the paper: JC SN SC.