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There was an error in an article published in the August issue of the journal (Hagerman PJ. The fragile X prevalence paradox. J Med Genet 2008;45:498–9). The sentence “Using an aggregate value (189/239,793; 1/126)…” which appeared on page 1, column 3, main paragraph, should read as follows: “Using an aggregate value (189/23,793; 1/126)…”.