1. Antibiotic Resistance Monitoring and Reference Laboratory, Centre for Infections, Health Protection Agency, London, United Kingdom
2. HAI & Infection Control Group, Health Protection Scotland, Glasgow, United Kingdom
3. Microbiology Department, Freeman Hospital, Newcastle Upon Tyne, United Kingdom
4. Microbiology Department, Southern General Hospital, Glasgow, United Kingdom
5. Department of Microbiology, Derriford Hospital, Plymouth, United Kingdom