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