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*School of Nursing, Center for Health Outcomes and Policy Research †Department of Sociology ‡Leonard Davis Institute of Health Economics, University of Pennsylvania, Philadelphia, PA The author declares no conflict of interest. Reprints: Linda H. Aiken, PhD, RN, FAAN, Center for Health Outcomes and Policy Research, School of Nursing, University of Pennsylvania, 418 Curie Blvd., Philadelphia, PA 19104-4217. E-mail: [email protected].
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