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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 ((biostatistics OR (biostatistical OR statistical)) OR (biostatistical 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 ((biostatistics OR (biostatistical OR statistical)) OR (biostatistical OR statistical)) AND epidemiology. ) OR ( practice guide to statistics AND epidemiology. ))*.