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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)) OR (((biostatistical OR statistical) OR (biostatistical OR statistical)) OR (biostatistical OR statistical))) AND epidemiology. ) OR ((( practical guide to statistics 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)) OR (((biostatistical OR statistical) OR (biostatistical OR statistical)) OR (biostatistical OR statistical))) AND epidemiology. ) OR ((( practical guide to statistics AND epidemiology. ) OR ( practice guide to statistics AND epidemiology. ))))*.