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Dr Ron D Hays is Professor in the Department of UCLA Division of General Internal Medicine and Health Services Research, Department of Medicine, Los Angeles, USA.
Survey Research; Physical function; Item Response Theory (IRT); Differential Item Functioning (DIF)
Research Article: Prim Health Care 2013, 3: 132
Research Article: Prim Health Care 2013, 3: 131
Research Article: Prim Health Care 2012, 2: 123
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