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