“…Study designs included cross-sectional (n=22), 17−22,24−28,30−37,44,47,49 case-control (n=1), 23 prospective and retrospective cohort (n=2), 29,40 retrospective cohort with pre-/post-intervention assessments (n=3), 38,41,43 mixed methods (n=3), 42,45,46 mixed methods with pre-/post-intervention (n=1), 39 and qualitative (n=1). 48 A variety of data sources were used to determine immunization status of children, including caregiver or self-report (n=5), 19,29,31,32,37 caregiver or self-held record (n=1), 42 child welfare data (n=6), 17,28,36,39,43,47 community health records (n=2), 25,38 electronic health database (n=5), 18,20,23,40,46 medical records (n=4), 21,22,27,34 electronic immunization databases (n=1), 24 and mixed data sources (n=7). 26,30,33,35,41,44,45 Very few studies (n=7) 18,21,24,…”