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• The words AND, OR and NOT may confuse the search; try adding quotes: "(((((( practical guidebook to ((biostatistics OR (biostatistical OR statistical)) OR (((biostatistics OR (biostatistical OR statistical)) OR (biostatistics OR (biostatistical OR statistical))) OR (biostatistics OR (biostatistical OR statistical)))) AND epidemiology. ) OR ( practical guidebook to ((biostatistics OR (biostatistical OR statistical)) OR (((biostatistics OR (biostatistical OR statistical)) OR (biostatistics OR (biostatistical OR statistical))) OR (biostatistics OR (biostatistical OR statistical)))) AND epidemiology. ))) OR ( practical guidebook to ((biostatistics OR (biostatistical OR statistical)) OR (((biostatistics OR (biostatistical OR statistical)) OR (biostatistics OR (biostatistical OR statistical))) OR (biostatistics OR (biostatistical OR statistical)))) AND epidemiology. ))) OR ( practical guide to statistics AND epidemiology. ))~".
• Adding a wildcard symbol may retrieve word variants: (((((( practical guidebook to ((biostatistics OR (biostatistical OR statistical)) OR (((biostatistics OR (biostatistical OR statistical)) OR (biostatistics OR (biostatistical OR statistical))) OR (biostatistics OR (biostatistical OR statistical)))) AND epidemiology. ) OR ( practical guidebook to ((biostatistics OR (biostatistical OR statistical)) OR (((biostatistics OR (biostatistical OR statistical)) OR (biostatistics OR (biostatistical OR statistical))) OR (biostatistics OR (biostatistical OR statistical)))) AND epidemiology. ))) OR ( practical guidebook to ((biostatistics OR (biostatistical OR statistical)) OR (((biostatistics OR (biostatistical OR statistical)) OR (biostatistics OR (biostatistical OR statistical))) OR (biostatistics OR (biostatistical OR statistical)))) AND epidemiology. ))) OR ( practical guide to statistics AND epidemiology. ))*.