1. Division of Infectious Diseases, Department of Medicine, Duke University School of Medicine , Durham, North Carolina , USA
2. Duke Center for Antimicrobial Stewardship and Infection Prevention , Durham, North Carolina , USA
3. Division of Infectious Diseases, Department of Medicine, University of North Carolina , Chapel Hill, North Carolina , USA
4. Department of Biostatistics and Bioinformatics, Duke University School of Medicine , Durham, North Carolina , USA
5. Division of Pediatric Infectious Diseases, Department of Pediatrics, Duke University School of Medicine , Durham, North Carolina , USA