A stacked ensemble machine learning model for the prediction of pentavalent 3 vaccination dropout in East Africa - Alemayehu, Meron Asmamaw; Kebede, Shimels Derso; Walle, Agmasie Damtew; Mamo, Daniel Niguse; Enyew, Ermias Bekele; Adem, Jibril Bashir (Frontiers in Big Data, 2025)