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