Fragile X families in a northern Swedish county: a genealogical study of possibly affected individuals in the nineteenth century.


Most studies of fragile X [fra(X)] families are able to document mental impairment only by family history. Using Swedish historical archives and the unique parish catechetical meeting records it is possible to document qualitative phenomena such as literacy for over 100 years. In this way it was possible to identify 7 individuals with mental retardation… (More)


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