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