Kanwal, Aasia, and Aisha Bashir. “Vitamin B12 in Pregnancy and Its Relationship With Maternal BMI and Gestational Diabetes Mellitus”. Pakistan Journal of Medical Sciences 38, no. 4 (March 5, 2022). Accessed May 3, 2024. https://www.pjms.org.pk/index.php/pjms/article/view/5120.