Erna Rahmawati. Relationship between Knowledge and Attitudes of Parents About IPV ( Inactivated Poliovirus Vaccine)Immunization at the Age of 4 – 18 Months. JGRPH [Internet]. 2023 Jun. 28 [cited 2025 Jul. 18];8(1):70-3. Available from: https://jgrph.org/index.php/JGRPH/article/view/439