Comment on "Heavy metals in agricultural soil of the European Union with implications for food safety" by Tóth, G., Hermann, T., Da Silva, M.R. and Montanarella, L. (December 2016) - Reimann, Clemens; Négrel, Philippe; Ladenberger, Anna; Birke, Manfred; Filzmoser, Peter; O'Connor, Patrick; Demetriades, Alecos