Institution: | a Department of Oral and Maxillofacial Surgery I, Graduate School of Dentistry, The Nippon Dental University, Fujimi, Tokyo 102-8159, Japan b Department of Oral Histology, School of Dentistry, Mastumoto Dental University, 1780 Hirooka-Gohbara, Shiojiri, Nagano 399-0781, Japan c Institute for Oral Science, Mastumoto Dental University, Shiojiri, Nagano 399-0781, Japan |