A national longitudinal cohort study of nurse practitioners and their employers conducted during [1973][1974][1975][1976] provided data on barriers to the development of the nurse practitioner role in primary care. Nearly 90 per cent of the 500 primary care nurse practitioners responding and 75 per cent of the 407 employers responding reported encountering one or more barriers to the role development of the nurse practitioner in their practice setting. Nurse practitioners
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