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