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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\ practical guidebook to ((((biostatistical OR statistics) OR (biostatistical OR statistics)) OR ((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: ((\ practical guidebook to ((((biostatistical OR statistics) OR (biostatistical OR statistics)) OR ((biostatistical OR statistics) OR (biostatistical OR statistics))) OR ((biostatistical OR statistics) OR (biostatistical OR statistics))) AND epidemiology.\ ) OR (\ practical guide to statistical AND epidemiology.\ ))*.