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