Roshanravan, Neda, et al. “Serum Levels of Copper, Zinc and Magnesium in Pregnant Women With Impaired Glucose Tolerance Test: A Case Control Study”. Progress in Nutrition, vol. 20, no. 1-S, Aug. 2018, pp. 325-9, https://doi.org/10.23751/pn.v20i1-S.6041.