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Change (mean 95 % confidence interval, n = 20) in pharyngeal pain intensity (a), irritation (b) and swallowing difficulty (c) of healthy volunteers, measured on visual analog scale (VAS), during (the grey shaded area) and after tonic pharyngeal stimulation with cold dry air (12 °C, 20 % humidity at 12 L/min for 15 min). Results are the means of two tests. VAS for pharyngeal irritation and swallowing difficulty were not recorded during the stimulation period
