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