“Prevalence of Vitamin B12 Deficiency in Early Pregnancy and its Association with Preterm Birth: A Prospective Cross-sectional Study” (2025) Global journal of medical and pharmaceutical sciences, 3(5), pp. 17–22. Available at: http://www.globapc.com/index.php/gjmps/article/view/108 (Accessed: 23 October 2026).