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