1. Division of Infectious Diseases,
2. Center for Pediatric Clinical Effectiveness, and
3. Divisions of Health Policy and Clinical Effectiveness and
4. General Pediatrics, Cincinnati Children's Hospital, Cincinnati, Ohio; and
5. Department of Biostatistics and Epidemiology, Center for Clinical Epidemiology and Biostatistics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania
6. Division of General Pediatrics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania;