Affiliation: | 1. Department of Otorhinolaryngology–Head and Neck Surgery, College of Medicine, Yeungnam University, Daegu, Republic of Korea;2. Department of Medicine, Ewha Womans University School of Medicine and Ewha Institute of Convergence Medicine, Seoul, Republic of Korea;3. Regional Center for Respiratory Diseases, Yeungnam University Medical Center, Daegu, Republic of Korea |