Abbey, Mkpe, Amadi S. C., Ocheche U. S., Wekere F. C. C., Altraide B. O., Oloyede O. A., Inimgba N. M., and Akani C. I. “Maternal Exposure to Carbon Monoxide in the First Trimester (7-13+6 Weeks) of Pregnancy in the Core Niger Delta”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 11, no. 7 (June 27, 2022): 1839–1847. Accessed December 4, 2025. https://www.ijrcog.org/index.php/ijrcog/article/view/11809.