[1] Univ Freiburg, ENT Clin, Freiburg, Germany
[2] Seoul Natl Univ, Coll Med, Seoul 151, South Korea
[3] Osaka Univ, Sch Med, Dept Otolaryngol, Suita, Osaka 565, Japan
[4] Univ Hosp, Dept Otolaryngol Head & Neck Surg, Las Palmas Gran Canaria, Spain
[5] Leiden Univ, Med Ctr, ENT Dept, NL-2300 RA Leiden, Netherlands
[6] Royal Victorian Eye & Ear Hosp, CRC Cochlear Implant & Hearing Aid Innovat, Melbourne, Vic, Australia
[7] Vanderbilt Univ, Med Ctr, Dept Otol & Neurotol, Nashville, TN USA