1. University of East Anglia, Norwich United Kingdom;
2. Communicable Disease Surveillance Centre – North West, Chester, United Kingdom;
3. Communicable Disease Surveillance Centre, London, United Kingdom;
4. Singleton Hospital, Swansea, United Kingdom;
5. University of Liverpool, Liverpool, United Kingdom;
6. Liverpool School of Tropical Medicine, Liverpool, United Kingdom;
7. United Utilities, Warrington, United Kingdom