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