1 Duke Center for Antimicrobial Stewardship and Infection Prevention, Division of Infectious Diseases, Duke University School of Medicine, Duke University Medical Center, PO Box 102359, Durham, NC 27710, USA. Electronic address: Libby.dodds@duke.edu.
2 Duke Center for Antimicrobial Stewardship and Infection Prevention, Division of Infectious Diseases, Duke University School of Medicine, Duke University Medical Center, PO Box 102359, Durham, NC 27710, USA. Electronic address: Steven.spires@duke.edu.