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