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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) OR statistical)) OR (statistical OR ((biostatistics OR statistical) OR statistical))) AND epidemiology.\ ) OR (\ practical guidebook to ((statistical OR ((biostatistics OR statistical) OR statistical)) OR (statistical OR ((biostatistics OR statistical) 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) OR statistical)) OR (statistical OR ((biostatistics OR statistical) OR statistical))) AND epidemiology.\ ) OR (\ practical guidebook to ((statistical OR ((biostatistics OR statistical) OR statistical)) OR (statistical OR ((biostatistics OR statistical) OR statistical))) AND epidemiology.\ ))) OR (((\ practical guide to statistics AND epidemiology.\ ) OR (\ practice guide to statistics AND epidemiology.\ ))))*.