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Fierro-Benitez于1966年首先成功地将智力测验引入厄瓜多尔碘缺乏病（IDD）区,发现未投碘IDD区的“正常人”中35％轻度智力落后;孕前注射与未注射碘油妇女所生孩子的智商（IQ）分别为83.7、72.7;Dodge1969年还证明孕前注射碘油可将亚克汀控制到5％以下。之后,Trowbridge、Thilly、Laggass等在其它IDD区作出了类似结果。国
Fierro-Benitez first successfully introduced an intelligence test in the Iodine-Depletion Disease (IDD) area of Ecuador in 1966 and found 35% of mild “mental retardation” among “normal people” in the IDD-free area; pre-pregnancy and non-injection of lipiodol Children with IQ (IQ) were 83.7,72.7; Dodge1969 stating that before the game can be used to control the natural quests to 5% or less. Later, Trowbridge, Thilly, Laggass and others made similar results in other IDD regions. country