Sep 01, 2016 · Unknown risk: coexposure to lead and other heavy metals among children living in smallscale mining communities in Zamfara State, Nigeria. Int J Environ Health Res 24:304319, doi: / . Crossref, Medline, Google Scholar; Bashir M, UmarTsafe N, Getso K, Kaita I, Nasadi A, SaniGwarzo N et al.. 2014.