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