Institution: | Ear, Nose, and Throat Clinic, University of Siena, Italy;1Univ. Klinikum der Universität zu Köln, Cologne, Germany;2Ear, Nose, and Throat Clinic, Policlinico “A. Gemelli”, Catholic University of the Sacred Heart, Rome, Italy;3Ear, Nose, and Throat Clinic, University “Tor Vergata”, Rome, Italy |