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