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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)) OR ((biostatistical OR statistics) OR (biostatistical OR statistics))) AND epidemiology. ) OR ( practical guidebook to (((biostatistical OR statistics) OR (biostatistical OR statistics)) OR ((biostatistical OR statistics) OR (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)) OR ((biostatistical OR statistics) OR (biostatistical OR statistics))) AND epidemiology. ) OR ( practical guidebook to (((biostatistical OR statistics) OR (biostatistical OR statistics)) OR ((biostatistical OR statistics) OR (biostatistical OR statistics))) AND epidemiology. ))) OR ( practical guide to statistical AND epidemiology. ))*.