Optimising availability and geographical accessibility to emergency obstetric care within a sub-national social health insurance scheme in Nigeria - Banke-Thomas, Aduragbemi; Olubodun, Tope; Olaniran, Abimbola A.; Wong, Kerry L. M.; Shah, Yash; Achugo, Daniel C.; Ogunyemi, Olakunmi (Frontiers in Health Services, 2024)