1. Department of Community Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
2. Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271 -8587, Japan
3. Nihon University Graduate School of Dentistry at Matsudo, Operative Dentistry, Matsudo, Chiba 271-8587, Japan
4. Department of Laboratory Medicine and Dentistry for the Compromised Patient, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
5. Department of Oral Surgery, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
6. Department of Microbiology and Immunology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba 271-8587, Japan
7. Nihon University Graduate School of Dentistry at Matsudo, Community Oral Health, Matsudo, Chiba 271-8587, Japan