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