Djagbletey, R.; Darkwa, E. O.; deGraft-Johnson, P. K. G.; Sottie, D. A. Y.; Essuman, R.; Aryee, G.; Aniteye, E. Serum Calcium and Magnesium Levels in Normal Ghanaian Pregnant Women: A Comparative Cross-Sectional Study. Open Access Maced J Med Sci 2018, 6, 2006-2011.