1. Department of Dentistry and Oral-Maxillofacial Surgery, Chiba University Hospital, Chiba, Japan
2. Department of Oral Science, Graduate School of Medicine, Chiba University, Chiba, Japan
3. Department of Oral and Craniofacial Health Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
4. Department of Medical Oncology, Graduate School of Medicine, Chiba University, Chiba, Japan
5. Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA