Efficacy and effectiveness of COVID-19 vaccines in Africa: A systematic review. - Raji, Tajudeen; Fallah, Mosoka Papa; Dereje, Nebiyu; Kakooza, Francis; Ndembi, Nicaise; Abdulaziz, Mohammed; Aragaw, Merawi; Kaseya, Jean; Ngongo, Alain Ngashi (PLoS ONE, 2024)