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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))) AND epidemiology.\ ) OR (\ practical guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ))) OR (((((\ practical guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ) OR (\ practical guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ))) OR (\ practice guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ))))) 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))) AND epidemiology.\ ) OR (\ practical guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ))) OR (((((\ practical guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ) OR (\ practical guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ))) OR (\ practice guidebook to ((biostatistics OR ((statistics OR biostatistics) OR biostatistics)) OR (biostatistics OR ((statistics OR biostatistics) OR biostatistics))) AND epidemiology.\ ))))) OR (\ practical guide to statistical AND epidemiology.\ ))*.