Astha, Divya. Serum magnesium level at 24 to less than 37 weeks: a prospective COHORT study predicting spontaneous preterm delivery. Int J Reprod Contracept Obstet Gynecol [Internet]. 2023 Oct. 27 [cited 2025 Oct. 28];12(11):3347-52. Available from: https://www.ijrcog.org/index.php/ijrcog/article/view/13547