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This is the peer reviewed version of the following article: Behavioural and cognitive phenotypes in idiopathic autism versus autism associated with fragile X syndrome / Danuta Loesch-Mdzewska ... [et al.] In: Journal of Child Psychology and Psychiatry, 50(3): 290-299, 2009 which has been published in final form at http://dx.doi.org/10.1111/j.1469-7610.2008.01988.x (Please note: access via this link may only be available with a subscription).