1. Departments of Oral Surgery, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba, 271-8587, Japan
2. Resarch Institute of Oral Science, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba, 271-8587, Japan
3. Departments of Pharmacology, Nihon University School of Dentistry at Matsudo, Matsudo, Chiba, 271-8587, Japan
4. Professor Emeritus, Nihon University, 4-8-24 Kudan-Minami, Chiyoda, Tokyo 102-8275, Japan