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