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• The words AND, OR and NOT may confuse the search; try adding quotes: "\"\\"\\\"((\\\"practical guidebook to (((biostatistical OR statistical) OR (biostatistical OR statistical)) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\\") OR (\\\"practical guide to statistics AND epidemiology.\\\\"))\\\"\\"\"".
• Removing quotes may allow a broader search: \ ((\ practical guidebook to (((biostatistical OR statistical) OR (biostatistical OR statistical)) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\ ) OR (\ practical guide to statistics AND epidemiology.\\ ))\.