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