1 Department of Anatomy and Experimental Oncology, Mons School of Medicine, University of Mons Research Institute for Health Sciences and Technology, University of Mons, Mons, Belgium.
2 Department of Otorhinolaryngology and Head and Neck Surgery, Reflux Clinic, Saint-Pierre University Hospital Center, Brussels, Belgium.
3 Laboratory of Phonetics, Faculty of Psychology, Research Institute for Language Sciences and Technology, University of Mons, Mons, Belgium.
4 Department of Otorhinolaryngology-Head and Neck Surgery, University Hospital Center of Liege, Liege, Belgium.