1. Department of Periodontology; Showa University School of Dentistry; Tokyo Japan
2. Division of Periodontology; Departmetnt of Cariology and Periodontology; Kyushu Dental University; Kitakyushu City Fukuoka Japan
3. Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Tokyo Japan
4. Dental Clinic; Showa University Medical Hospital; Tokyo Japan
5. Department of Oral and Maxillofacial Surgery; Saitama Medical University; Saitama Japan
6. Department of Orthopaedic Surgery; Tokyo Medical and Dental University; Tokyo Japan