1. Infectious Disease Clinical Research Program, Preventive Medicine & Biostatistics Department, Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
2. Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. , Bethesda, MD 20817, USA
3. Brooke Army Medical Center , JBSA Fort Sam Houston, TX 78234, USA
4. U.S. Army Institute of Surgical Research , JBSA Fort Sam Houston, TX 78234, USA
5. Walter Reed Army Institute of Research , Silver Spring, MD 20910, USA
6. Multidrug-Resistant Organisms Repository and Surveillance Network, Walter Reed Army Institute of Research , Silver Spring, MD 20910, USA
7. Naval Medical Research Center , Silver Spring, MD 20910, USA