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• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( ((practice guidebook) OR (practical guidebook)) to (((biostatistics OR statistical) OR statistical) OR ((biostatistics OR statistical) OR statistical)) AND epidemiology. ) OR ( ((practice guidebook) OR (practical guidebook)) to ((biostatistics OR statistical) OR statistical) AND epidemiology. ))) OR ( ((practice guidebook) OR (practical guidebook)) to ((biostatistics OR statistical) OR statistical) AND epidemiology. ))) OR ( ((practice guide) OR (practical guide)) to statistics AND epidemiology. ))~".
• Adding a wildcard symbol may retrieve word variants: (((((( ((practice guidebook) OR (practical guidebook)) to (((biostatistics OR statistical) OR statistical) OR ((biostatistics OR statistical) OR statistical)) AND epidemiology. ) OR ( ((practice guidebook) OR (practical guidebook)) to ((biostatistics OR statistical) OR statistical) AND epidemiology. ))) OR ( ((practice guidebook) OR (practical guidebook)) to ((biostatistics OR statistical) OR statistical) AND epidemiology. ))) OR ( ((practice guide) OR (practical guide)) to statistics AND epidemiology. ))*.