Contamination of chicken eggs near the Pajaritos Petrochemical Complex in Coatzacoalcos, Veracruz, Mexico by dioxins, PCBs and hexachlorobenzene Leer más sobre Contamination of chicken eggs near the Pajaritos Petrochemical Complex in Coatzacoalcos, Veracruz, Mexico by dioxins, PCBs and hexachlorobenzene