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