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