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• The words AND, OR and NOT may confuse the search; try adding quotes: "\"((((\\"practical guide to (((biostatistics OR statistical) OR statistical) OR statistical) AND epidemiology.\\") OR (\\"practical guide to statistical AND epidemiology.\\"))) OR (\\"practice guide to statistics AND epidemiology.\\"))*\"".
• Removing quotes may allow a broader search: (((( practical guide to (((biostatistics OR statistical) OR statistical) OR statistical) AND epidemiology. ) OR ( practical guide to statistical AND epidemiology. ))) OR ( practice guide to statistics AND epidemiology. ))*.