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