[1] Univ Hosp Liege, ENT Dept, Liege, Belgium
[2] Univ Hosp Liege, Dept Nursing, Liege, Belgium
[3] Univ Liege, Fac Med, Dept Gen Med, Res Unit Primary Care & Hlth, Liege, Belgium
[4] Univ Liege, Dept Neuroanat & Neurosurg, Liege, Belgium
[5] CHU Liege, Liege, Belgium
[6] Univ Hosp Liege, ENT Dept, Sart Tilman B35, B-4000 Liege, Belgium