Ron D Hays
Professor, UCLA Division of General Internal Medicine and Health Services Research, Department of Medicine, 911 Broxton Avenue, Los Angeles, CA 90095-1736, USA
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)
