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