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Whittington J, Holland A, Webb T, Butler J, Clarke D, Boer H «Cognitive abilities and genotype in a population-based sample of people with Prader-Willi syndrome». J Intellect Disabil Res, 48, Pt 2, febrer 2004, pàg. 172–87. DOI: 10.1111/j.1365-2788.2004.00556.x. PMID: 14723659.