1. Department of Periodontology; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima Japan
2. Department of Periodontology; College of Dental Medicine; Nova Southeastern University; Fort Lauderdale FL USA
3. Department of Periodontics and Oral Medicine; University of Michigan School of Dentistry; Ann Arbor MI USA
4. Shin Nippon Biomedical Laboratories, Ltd; Kagoshima Japan
5. Robert K. Schenk Laboratory of Oral Histology; University of Bern; Bern Switzerland
6. Department of Periodontology; School of Dental Medicine; University of Bern; Bern Switzerland