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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 guide to (biostatistical OR statistics) AND epidemiology. ) OR ((( practical guide to (biostatistical OR statistics) AND epidemiology. ) OR ( practical guide to (biostatistical OR statistics) AND epidemiology. ))))))))) OR ( practice 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 guide to (biostatistical OR statistics) AND epidemiology. ) OR ((( practical guide to (biostatistical OR statistics) AND epidemiology. ) OR ( practical guide to (biostatistical OR statistics) AND epidemiology. ))))))))) OR ( practice guide to statistical AND epidemiology. ))*.