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CBF: mean and distribution of the values of CBF for the control (•), Physiomer® (■), Stérimar® (▲), and normal saline 0.9% (▼) conditions. CBF is expressed in hertz (Hz). **p = 0.0039, **p = 0.0059, CBF = ciliary beat frequency; CTRL = control; ns = nonsignificant.
