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