Ezechukwu, Clement C, Chijioke E Ezeudu, Nkechinyere Obichukwu, Sunday Ameh, and Amara Egbuogu. 2022. “ Nigeria: Risk Factors of Preterm Delivery and Its Prevalence in a Tertiary Hospital”. Tropical Journal of Medical Research 21 (2). Nigeria:49-55. https://doi.org/10.5281/zenodo.7794785.