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