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Testing item response theory invariance of the standardized Quality-of-life Disease Impact Scale (QDIS(?)) in acute coronary syndrome patients: differential functioning of items and test.

Deng N, Anatchkova MD, Waring ME, Han KT, Ware JE. Testing item response theory invariance of the standardized Quality-of-life Disease Impact Scale (QDIS(?)) in acute coronary syndrome patients: differential functioning of items and test. Qual Life Res. 2015 Aug; 24(8):1809-22.

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