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