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