1. Collaborative Research Group, Tokyo Plastic Dental Society, Tokyo, Japan
2. Implant Dentistry, Nihon University School of Dentistry, Dental Hospital, Tokyo, Japan
3. Division of Anatomy and Cell Biology of the Hard Tissue, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan
4. Division of Oral and Maxillofacial Surgery, Matsumoto Dental University Hospital, Shiojiri, Japan
5. Department of Periodontology, University of Bern, Bern, Switzerland
6. Division of Oral Bioengineering, Institute of Medicine and Dentistry, Niigata University, Niigata, Japan