Vaccination services—not populations—are ‘hard-to-reach’: what can health authorities in Africa do to improve access? by Abdu A. Adamu, Chukwudi A. Nnaji, Charles S. Wiysonge

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Exploring the complexity of the implementation determinants of human papillomavirus vaccination in Africa through a systems thinking lens: A rapid review by Abdu A. Adamu, Rabiu I. Jalo, Duduzile Ndwandwe, Charles S. Wiysonge

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Positioning implementation science in national immunization programmes to improve coverage equity and advance progress toward Immunization Agenda 2030: An urgent global health impe... by Abdu A. Adamu, Duduzile Ndwandwe, Rabiu I. Jalo, Charles S. Wiysonge

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The Propagation Properties of a Lorentz–Gauss Vortex Beam in a Gradient-Index Medium by Mohammed S. Qusailah, Abdu A. Alkelly, Wafa’a A. Al-Bahry

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Propagation of Partially Coherent Flat-Topped Vortex Hollow Beams in Anisotropic Turbulent Plasma by Abdu A. Alkelly, M. A. H. Khaled, Labiba F. Hassan

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Sustainable financing for vaccination towards advancing universal health coverage in the WHO African region: The strategic role of national health insurance by Abdu A. Adamu, Rabiu I. Jalo, Ibrahim D. Muhammad, Téné-Alima Essoh, Duduzile Ndwandwe, Charles S. Wiysonge

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Authors’ reply by Ali M. M. Assiri, Yahia M. Al Khaldi, Abdu A. A. Kaabi, Ibrahim A. M. Alshehri, Mohammad A. S. Al Shahrani, Abdullah A. Almalki

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T-Cell Mediated Immune Responses in Obstetric Population Acutely Infected With Toxoplasmosis in Kano, Nigeria by Ibrahim, A., Kumurya, A. S., Yahaya, H., Abdu, A., Ado, B. K., Ella, E. E., Suleiman, A. B., Sulaiman, M. A., Aminu, M. A, Koki, A. Y.

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