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