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