1. Department of Oral and Maxillofacial Surgery/Orthodontics, Yokohama City University Hospital, Pathology, Yokohama, Kanagawa, Japan
2. Department of Plastic and Reconstructive Surgery, Chigasaki Municipal Hospital, Chigasaki, Kanagawa, Japan
3. Department of Pathology Yokohama City University Hospital, Yokohama, Kanagawa, Japan
4. Department of Plastic and Reconstructive Surgery, Yokohama City University Hospital, Yokohama, Kanagawa, Japan