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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))) OR ((biostatistical OR biostatistical) OR ((biostatistical OR biostatistical) OR (biostatistical OR biostatistical))))) AND epidemiology.\\\\") OR (\\\"((practice guide) OR (practical guide)) to (statistics OR statistical) AND epidemiology.\\\\"))\\\"\\"\"".
• Removing quotes may allow a broader search: \ ((\ 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))) OR ((biostatistical OR biostatistical) OR ((biostatistical OR biostatistical) OR (biostatistical OR biostatistical))))) AND epidemiology.\\ ) OR (\ ((practice guide) OR (practical guide)) to (statistics OR statistical) AND epidemiology.\\ ))\.