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