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Mean cough frequency in 15 healthy subjects (empty columns) and 30 patients with URTI (filled columns) induced by vibration of the throat at the level of the jugular notch with a modified battery-operated shaver. The stimulus was applied for around 2 s, with six stimulation episodes separated by a rest of 2 min [9]. Coughs were counted in the 30 s period immediately after the stimulus.
