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