1. Department of Otolaryngology-Head & Neck Surgery; Keimyung University Dongsan Medical Center; Daegu Korea
2. Department of Surgery; King Fahad Specialist Hospital; Dammam Saudi Arabia
3. Department of Otolaryngology; Asan Medical Center, University of Ulsan College of Medicine; Seoul Korea
4. Department of Nuclear Medicine; Asan Medical Center, University of Ulsan College of Medicine; Seoul Korea