Affiliation: | 1. Children''s Outcomes Research Program, The Children''s Hospital, Aurora, CO, USA;2. Department of Pediatrics, University of Colorado, Aurora, CO, USA;3. The Colorado Health Outcomes Program, University of Colorado, Aurora, CO, USA;4. Colorado School of Public Health, University of Colorado, Aurora, CO, USA;5. National Center for Immunization and Respiratory Diseases, CDC, Atlanta, GA, USA;6. Department of Family Medicine, University of Colorado, Aurora, CO, USA |