Shkolna, I.I., Tarasova, I.V., Markevych, V.V., Petrashenko, V.O., Zagorodnii, M.P. and Hordienko, O.V. 2017. Content and balance of trace elements in placenta on different stages of gestation. Zaporozhye Medical Journal. 19, 1 (Feb. 2017). DOI:https://doi.org/10.14739/2310-1210.2017.1.91708.