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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))) AND epidemiology.\\\ ) OR (((\\\ practical guidebook to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ) OR (((\\\ practical guide to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ) OR (((\\\ practical guide to (((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) OR ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical)))) AND epidemiology.\\\ ) OR (\\\ practical guide to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ))))))))) OR (\\\ practice guide to statistics AND epidemiology.\\\ ))~\\ \".
• Adding a wildcard symbol may retrieve word variants: \ \\ ((((\\\ practical guidebook to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ) OR (((\\\ practical guidebook to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ) OR (((\\\ practical guide to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ) OR (((\\\ practical guide to (((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) OR ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical)))) AND epidemiology.\\\ ) OR (\\\ practical guide to ((biostatistical OR statistical) OR ((biostatistical OR statistical) OR (biostatistical OR statistical))) AND epidemiology.\\\ ))))))))) OR (\\\ practice guide to statistics AND epidemiology.\\\ ))~\\ \*.