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In page Phenylketonuria:
"Phenylketonuria was discovered by the Norwegian physician Ivar Asbjørn Følling in 1934[3] when he noticed hyperphenylalaninemia (HPA) was associated with intellectual disability. In Norway, this disorder is known as Følling's disease, named after its discoverer.[4] Følling was one of the first physicians to apply detailed chemical analysis to the study of disease.[citation needed]
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