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- Spitzer W. O., Sackett D. L., Sibley J. C., Roberts R. S., Gent M., Kergin D. J., Hackett B. C., Olynich A. The Burlington randomized trial of the nurse practitioner. N Engl J Med. 1974 Jan 31;290(5):251–256. doi: 10.1056/NEJM197401312900506. [DOI] [PubMed] [Google Scholar]

