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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)) 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)) AND epidemiology.\ ))))))) OR (\ practice guide to statistics AND epidemiology.\ ))*.