A Study To Assess The Knowledge Regarding Optional Vaccines And Its Purpose Among Mothers Of Under Five Children In Selected Community Area At Hassan. Journal of Pharmaceutical Negative Results, [S. l.], p. 833–836, 2023. DOI: 10.47750/. Disponível em: https://pnrjournal.com/index.php/home/article/view/10761.. Acesso em: 10 jun. 2026.