Emily McCormick, MPH¹, Matthew F. Daley, MD², Tara Vogt, PhD³, Josh Durfee, MSPH⁴ and Judith Shlay, MD, MSPH¹, 1Denver Public Health, Denver Health, Denver, CO, 2Department of Pediatrics, University of Colorado Denver, Institute for Health Research, Kaiser Permanente Colorado, Denver, CO, 3National Center for Immunizations and Respiratory Disease, Centers for Disease Control and Prevention, Atlanta, GA, 4Department of Administration, Denver Health and Hospital Authority, Denver, CO