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