1. Department of Dermatology, Korea University College of Medicine, Seoul, Korea.
2. Department of Anatomy, Korea University College of Medicine, Seoul, Korea.
3. Department of Otorhinolaryngology-Head and Neck Surgery, Korea University Guro Hospital, Korea University Medicine, Seoul, Korea.
4. Division of Brain Korea 21 Plus Program for Biomedical Science, Korea University College of Medicine, Seoul, Korea.