Joni Reynolds, RN, CNS, MSN¹, Diana Herrero, MS², Allison Kempe, MD, MPH³, Sheri Eisert, PhD⁴, Alison Saville, MSPH, MSW³, L. Miriam Dickinson, PhD⁵, Brenda Beaty, MSPH⁶, Karen Albright, PhD³, Eva Dibert, MHA and Vicky Koehler, MPH⁸, 1Immunization Program, Colorado Department of Public Health and Environment, Denver, CO, 2Colorado Department of Public Health & Environment, Coloroado Immunization Information System, Denver, CO, 3Children's Outcomes Research Program, University of Colorado Denver, Aurora, CO, 4US Department of Veteran Affairs, Colorado Veterans Administration Health Care System, Denver, CO, 5Department of Family Medicine, University of Colorado Denver, Aurora, CO, 6Colorado Health Outcomes Research, University of Colorado Denver, 7University of Colorado Denver, Children's Outcomes Research Program, Aurora, CO