1. Health Protection Scotland, Glasgow, United Kingdom
2. Health Protection Agency Health Protection Services – Colindale, London, United Kingdom
3. International Prevention Research Institute, Lyon, France
4. University of Strathclyde, Glasgow, United Kingdom
5. Royal College of General Practitioners Research and Surveillance Centre, Birmingham, United Kingdom
6. Health Protection Agency Microbiology Services – Colindale, London, United Kingdom
7. Public Health Wales, Cardiff, United Kingdom
8. Public Health Agency Northern Ireland, Belfast, United Kingdom