1 Department of Pediatrics, Perelman School of Medicine at the University of Pennsylvania School and Children's Hospital of Philadelphia (AG Fiks), Philadelphia, Pa; Center for Pediatric Clinical Effectiveness (CPCE) and the Possibilities Project, Children's Hospital of Philadelphia (AG Fiks and E Nekrasova), Philadelphia, Pa. Electronic address: fiks@email.chop.edu.
2 Center for Pediatric Clinical Effectiveness (CPCE) and the Possibilities Project, Children's Hospital of Philadelphia (AG Fiks and E Nekrasova), Philadelphia, Pa.
3 Community Health Services, Denver Health (SJ Hambidge), Denver, Colo; Department of Pediatrics, University of Colorado School of Medicine (SJ Hambidge), Denver, Colo.