"Since 2006, epidemiological studies have documented six additional developmental neurotoxicants - manganese, fluoride, chlorpyrifos, dichlorodiphenyltrichloroethane, tetrachloroethylene, and the polybrominated dihenyl ethers.
"Kusukela ngo-2006, izifundo ze-epidemiological ziye zabhala ezinye izinzwa eziyisithupha ezithuthukisa i-neurotoxicants - i-manganese, i-fluoride, i-chlorpyrifos, i-dichlorodiphenyltrichloroethane, i-tetrachlorethylene, ne-polybrominated diphenyl ether."