About the Authors

Maha Bouzid

Affiliation Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom

Lee Hooper

Affiliation Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom

Paul R. Hunter

paul.hunter@uea.ac.uk

Affiliation Norwich Medical School, University of East Anglia, Norwich, Norfolk, United Kingdom

Competing Interests

PRH was chair of the science advisory committee of Suez Environment until 2010. The authors have declared that no other competing interests exist. This does not alter the authors' adherence to all the PLOS ONE policies on sharing data and materials.

Author Contributions

Conceived and designed the experiments: PH MB. Analyzed the data: MB LH PH. Wrote the paper: MB LH PH.