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Rothman KJ, Greenland S. Modern epidemiology. 2 nd ed. Philadelphia, PA: Lippincott & Raven; 1998. Abstract
Book Chapter
Spencer L, Ritchie J, Ormston R, O'Connor W. "Analysis: Principles and Processes." In: Ritchie J, Lewis J, McNaughton Nicholls C, Ormston R, eds. Qualitative Research Practice . London: Natcen, SAGE Publications Ltd ; 2014.
Journal Article