Marszalek, M. et al. 2022. Are children who do not receive their first Measles Mumps and Rubella (MMR1) vaccination by 24 months more likely to share a household with older non-vaccinated children? Linked household-level analysis of primary care electronic health records (EHRs). International Journal of Population Data Science. 7, 3 (Aug. 2022). DOI:https://doi.org/10.23889/ijpds.v7i3.2059.