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