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• The words AND, OR and NOT may confuse the search; try adding quotes: "(((( (practical OR practice) guidebook to (biostatistical OR (biostatistical OR biostatistical)) AND epidemiology. ) OR ( (practical OR practice) guidebook to (biostatistical OR (biostatistical 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 (biostatistical OR (biostatistical OR biostatistical)) AND epidemiology. ) OR ( (practical OR practice) guidebook to (biostatistical OR (biostatistical OR biostatistical)) AND epidemiology. ))) OR ( (practical OR practice) guide to statistical AND epidemiology. ))*.