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