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