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