Study protocol for a cluster-randomised controlled trial of hybrid parents and health workers adaptive intervention for optimal routine childhood immunisation coverage in the commu... von Omale, Ugwu I, Ewah, Richard L, Amuzie, Chidinma I, Ikegwuonu, Cordis O, Nkwo, Glory E, Iwegbulam, Chimaobi C, Ekwuazi, Louisa C

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