1. Laboratory of HealthCare Associated Infection
2. University Hospital Birmingham NHS Foundation Trust, Queen Elizabeth Medical Centre, Birmingham B15 2TJ, United Kingdom
3. Antibiotic Resistance Monitoring and Reference Laboratory, Centre for Infections, Health Protection Agency, London NW9 5EQ, United Kingdom
4. Walter Reed Army Institute of Research, Silver Spring, Maryland 20910
5. Walter Reed Army Medical Center, Washington, D.C.
6. Landstuhl Regional Medical Center, Landstuhl, Germany