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