1. Department of Otorhinolaryngology‐Head & Neck Surgery Hallym University College of Medicine Hwaseong Korea
2. Department of Otolaryngology‐Head & Neck Surgery, Kresge Hearing Research Institute University of Michigan Medical School Ann Arbor Michigan U.S.A.
3. Department of Otorhinolaryngology–Head and Neck Surgery Kyung Hee University School of Medicine Seoul Korea