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