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Effects of increasing sniff volume on olfactory performance. (a) Increases in sniff volume from spontaneous sniffing (Pre) to sniffing after instructions (Post), in the 10 worst olfactory performing patients. (b) Improvement in olfactory performance between baseline (Pre) and after sniff volume increases (Post) in the same 10 worst olfactory performing patients. Increasing sniff volume led to a significant improvement in performance.
