1. Children’s Outcomes Research Program, Children’s Hospital Colorado, Aurora2Department of Pediatrics, University of Colorado, Denver
2. Children’s Outcomes Research Program, Children’s Hospital Colorado, Aurora
3. Children’s Outcomes Research Program, Children’s Hospital Colorado, Aurora3Colorado Health Outcomes Program, University of Colorado, Denver4Department of Family Medicine, University of Colorado, Denver
4. Children’s Outcomes Research Program, Children’s Hospital Colorado, Aurora3Colorado Health Outcomes Program, University of Colorado, Denver
5. Department of Health Policy and Management, University of South Florida, Tampa6Department of Pediatrics, University of South Florida, Tampa
6. Colorado Immunization and Information System, Colorado Department of Public Health and Environment, Denver