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