H.-S. Choi, H.-Y. Ahn, and J.-J. Woo, “Heavy metal concentrations in the blood and the risk of allergic diseases for South Korean children and adolescents”, IJET, vol. 8, no. 1.4, pp. 527–532, Jan. 2019, doi: 10.14419/ijet.v8i1.4.25464.