1. Cranfield University, Institute for Environment, Health; Risks and Futures; Cranfield Bedfordshire MK43 0AL UK
2. Animal and Plant Health Agency; Department of Epidemiological Sciences; Woodham Lane, New Haw Addlestone Surrey KT15 3NB UK
3. Department for Environment; Food and Rural Affairs; Area 1D, Nobel House, 17 Smith Square London SW1P 3JR UK