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