Oboro, Victor Oyenkekaibe, Temitope Olugbenga Bello, and Ayodeji Olaolu Oyeniran. “First Trimester Sonographic Dating Formula for the Nigerian Obstetric Population”. West African Journal of Radiology 19, no. 1 (August 15, 2025): 1–4. Accessed March 21, 2026. https://wajr.org/index.php/home/article/view/225.