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