1. Division of Infectious Diseases, Duke University School of Medicine, Durham, North Carolina
2. Duke Center for Antimicrobial Stewardship and Infection Prevention, Durham, North Carolina
3. Division of Infectious Diseases and International Health, University of Virginia School of Medicine, Charlottesville
4. Division of Pulmonary, Allergy, and Critical Care Medicine, Duke University School of Medicine, Durham, North Carolina
5. Duke University Clinical Microbiology Laboratory, Durham, North Carolina