Specialty fields practice differences spawned by managed care.
Canavan
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D000575:American Nurses' Association; D003695:Delivery of Health Care / Q000639:trends*; D006801:Humans; D008329:Managed Care Programs / Q000639:trends*; D009720:Nurse Clinicians; D009722:Nurse Practitioners; D013041:Specialties, Nursing; D014481:United States