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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 biostatistical and epidemiology.\"))) OR (\"practical guidebook to biostatistics and epidemiology.\"))) OR (\"practical guide to statistical and epidemiology.\"))~".
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• Adding a wildcard symbol may retrieve word variants: (((((("practical guidebook to biostatistical and epidemiology.") OR ("practice guidebook to biostatistical and epidemiology."))) OR ("practical guidebook to biostatistics and epidemiology."))) OR ("practical guide to statistical and epidemiology."))*.