ASD is caused by multiple factors,some of the pathogenic factors or possible pathogenic factors have not been clearly identified. For example, the detection of trace elements in some children with ASD found that iron content was lower than normal. Whether the lower-than-normal level of trace iron causes the lower-than-normal level of brain iron remains to be further confirmed, as does the direction of causality, i.e., whether the abnormal level of brain iron leads to the occurrence of the disease or whether the disease leads to the abnormal level of brain iron .
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