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