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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)) AND epidemiology.\\\\ ) OR (((\\\\ practical guide to ((biostatistical OR statistics) OR (biostatistical OR statistics)) AND epidemiology.\\\\ ) OR (\\\\ practical guide to (((biostatistical OR statistics) OR (biostatistical OR statistics)) OR ((biostatistical OR statistics) OR (biostatistical OR statistics))) AND epidemiology.\\\\ ))))) OR (\\\\ practice guide to statistical AND epidemiology.\\\\ ))~\\\ \\ \*".