Educational Portal: Zdeněk Kabelka, orl.2lf(at)lfmotol.cuni.cz, Department of Otorhinolaryngology Department of Otorhinolaryngology , Charles University, 2nd Medical FacultyCharles University, 2nd Medical Faculty, phone: +420 224432601, fax: +420 , address: V Úvalu 84, 150 06 Praha 5