1. Division of Infectious Diseases, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
3. Department of Hospital Epidemiology and Infection Control, The Johns Hopkins Hospital, Baltimore, Maryland
4. Department of Pediatrics, Cooper University Health Care, Camden, New Jersey
5. Division of Medical Microbiology, Department of Pathology, The Johns Hopkins Hospital, Baltimore, Maryland
6. Division of Neonatology, Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, Maryland
7. Division of Infectious Diseases, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland
8. Division of Medical Microbiology, Department of Pathology, Johns Hopkins University School of Medicine, Baltimore, Maryland
9. Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland