1. Division of Infections and Molecular Biology, Department of Health Promotion, Kyushu Dental College, Kitakyushu, Japan.
2. Division of Oral and Maxillofacial Diagnostic and Surgical Science, Department of Oral and Maxillofacial Surgery, Kyushu Dental College, Kitakyushu, Japan.
3. Department of Oral and Maxillofacial Surgery, Faculty of Medicine, University of Miyazaki, Miyazaki, Japan.