1. Department of Otorhinolaryngology‐Head & Neck Surgery CHA Bundang Medical Center, CHA University Seongnam Korea
2. Department of Otorhinolaryngology‐Head & Neck Surgery Hallym University College of Medicine Anyang Korea
3. Department of Internal Medicine Hallym University College of Medicine Anyang Korea
4. Department of Laboratory Medicine Hallym University College of Medicine Anyang Korea