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