1. Department of Pathology
2. Department of Oral and Maxillofacial Surgery
3. Center for General Medical Education and Clinical TrainingKindai University Faculty of Medicine377‐2 Ohno‐Higashi, Osaka‐Sayama Osaka Japan
4. Department of MicrobiologyMeiji Pharmaceutical University, 2‐522‐1 Noshio, KiyoseTokyo Japan