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