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