Acknowledgements
This research has been partially funded by CFL (Centro de Foniatria y Logopedia). The authors want to thank Marina Crespo, Alvaro Gomez and Cristina Mediavilla for their help collecting the data and Robert Jenkins for proofreading the texts.
Appendix
Appendix 1. Gauze treatment task procedure: participants breathed through the nose wrapped in a damp gauze.
