About the Authors
- Fiona M. Underwood
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* E-mail: fiona@fmunderwood.com
Affiliations Department of Mathematics and Statistics, University of Reading, Reading, United Kingdom, Independent Consultant, Reading, United Kingdom
- Robert W. Burn
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Affiliation Independent Consultant, Reading, United Kingdom
- Tom Milliken
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Affiliation TRAFFIC International, Harare, Zimbabwe
Competing Interests
The authors have declared that they have no competing interest.
Author Contributions
Analyzed the data: FMU RWB. Wrote the paper: FMU RWB TM. Conceived and designed and managed the study: FMU RWB. Database design: RWB. Database management: TM.