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