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