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Research in Developmental Disabilities > 2012 > 33 > 6 > 1984-1989
Journal of the American Medical Directors Association > 2012 > 13 > 7 > 595-601
Research in Developmental Disabilities > 2010 > 31 > 2 > 367-375
Journal of Pain > 2009 > 10 > 4 > 398-407