[1] Univ Udine, ENT Clin, Dept Surg Sci, Policlin Univ, I-33100 Udine, Italy
[2] Karl Hansen Med Ctr, Dept Otorhinolaryngol Head & Neck Surg, Bad Lippspringe, Germany
[3] Montefiore Med Ctr, Albert Einstein Coll Med, Dept Surg, Bronx, NY 10467 USA
[4] Univ Cape Town, Fac Hlth Sci, Div Otolaryngol, ZA-7925 Cape Town, South Africa
[5] Boston Univ, Sch Med, Dept Otolaryngol, Boston, MA 02118 USA
[6] Royal Surrey Cty Hosp, Dept Otolaryngol Head & Neck Surg, Guildford, Surrey, England