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• If you are trying to use Boolean operators, they must be ALL CAPS: (((((( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology. ) OR ( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology. ))) OR ( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) AND epidemiology. ))) OR ( (practical OR practice) guide to statistics AND epidemiology. ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology. ) OR ( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology. ))) OR ( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology. ))) OR ( (practical OR practice) guide to statistics and epidemiology. ))~".
• Adding a wildcard symbol may retrieve word variants: (((((( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology. ) OR ( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology. ))) OR ( (practical OR practice) guidebook to ((statistical OR statistical) OR ((statistical OR statistical) OR (statistical OR statistical))) and epidemiology. ))) OR ( (practical OR practice) guide to statistics and epidemiology. ))*.