1. Department of Plastic and Reconstructive Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
2. Department of Neurosurgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
3. Department of Otolaryngology, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
4. Department of Head and Neck Surgery, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan