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Balcazar F, MacKay-Murphy M, Keys C, Henry D, Bryant F.Balcazar F, et al.Am J Ment Retard. 1998 Mar;102(5):451-63. doi: 10.1352/0895-8017(1998)102<0451:apaatt>2.0.co;2.Am J Ment Retard. 1998.PMID: 9544342