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APA Citation
Brown, C., Hofer, T., Johal, A., Thomson, R., Nicholl, J., Franklin, B. D., & Lilford, R. J. (2008). an epistemology of patient safety research: a framework for study design and interpretation. Part 3. End points and measurement. Quality & safety in health care, 17(3), 170–177. http://access.bl.uk/ark:/81055/vdc_100144238375.0x000013