Roland Giger1, Lluís Nisa2. 1. Department of Otorhinolaryngology and Head and Neck Surgery, Inselspital, Bern University Hospital, Bern, Switzerland. Electronic address: roland.giger@insel.ch. 2. Department of Otorhinolaryngology and Head and Neck Surgery, Inselspital, Bern University Hospital, Bern, Switzerland.