Astha and Divya 2023. Serum magnesium level at 24 to less than 37 weeks: a prospective COHORT study predicting spontaneous preterm delivery. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 12, 11 (Oct. 2023), 3347–3352. DOI:https://doi.org/10.18203/2320-1770.ijrcog20233307.