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• The words AND, OR and NOT may confuse the search; try adding quotes: "\ (( (practical OR practice) guidebook to ((((biostatistical OR biostatistics) OR statistical) OR ((biostatistical OR biostatistics) OR statistical)) OR (((biostatistical OR biostatistics) OR statistical) OR ((biostatistical OR biostatistics) 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 ((((biostatistical OR biostatistics) OR statistical) OR ((biostatistical OR biostatistics) OR statistical)) OR (((biostatistical OR biostatistics) OR statistical) OR ((biostatistical OR biostatistics) OR statistical))) AND epidemiology.\\ ) OR ( (practical OR practice) guide to statistics AND epidemiology.\\ ))*\*.