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