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