1. Department of Dermatology, Chung-Ang University College of Medicine, Seoul, South Korea
2. Department of Medicine, Graduate School, Chung-Ang University College of Medicine, Seoul, South Korea
3. Department of Otorhinolaryngology-Head and Neck Surgery, Chung-Ang University College of Medicine, Seoul, South Korea
4. Department of Emergency Medicine, Chung-Ang University College of Medicine, Seoul, South Korea