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2. Down syndrome – a gene dosage disease caused by trisomy of genes within a small segment of the long arm of chromosome 21, exemplified by the study of the effects from the superoxide type-1 (SOD-1) gene;Anneren;AMPIS Suppl.,1993
3. Selenium therapy in Down syndrome: a theory and clinical trial;Antila,1990
4. The Merck manual,1999
5. Health care concerns and guidelines for adults with Down syndrome;van Allen;Am. J. Med. Genet.,1999