1. Department of Otorhinolaryngology – Head & Neck Surgery Seoul National University Bundang Hospital, Seoul National University College of Medicine Seongnam South Korea
2. Department of Otolaryngology – Head & Neck Surgery Jaber Al‐Ahmad Hospital, Ministry of Health South Surra Kuwait
3. Department of Otorhinolaryngology – Head & Neck Surgery Asan Medical Center, University of Ulsan College of Medicine Seoul South Korea
4. Department of Otorhinolaryngology – Head & Neck Surgery Seoul National University Hospital, Seoul National University College of Medicine Seoul South Korea