Khurram, M. S. A., and K. A. Khan. “A Longitudinal Study of Immunization Status and Reasons for Non-Vaccination of Children in OPD and Pediatric Ward of a Teaching Hospital”. International Journal of Contemporary Pediatrics, vol. 7, no. 9, Aug. 2020, pp. 1853-9, doi:10.18203/2349-3291.ijcp20203642.