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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 2. Study design. Quality & safety in health care, 17(3), 163–169. http://access.bl.uk/ark:/81055/vdc_100144734140.0x00000d