[1] Department of Otorhinolaryngology,
[2] University of Ioannina Medical School,undefined
[3] P.O. Box 1186,undefined
[4] GR-45110 Ioannina,undefined
[5] Greece,undefined
[6] Department of Otorhinolaryngology,undefined
[7] University of Ghent Medical School,undefined
[8] Ghent,undefined
[9] Belgium,undefined