1. Department of Oral Medicine, Infection, and Immunity Harvard School of Dental Medicine 188 Longwood Avenue Boston MA 02115 USA
2. Department of Periodontology Graduate School of Medical and Dental Sciences Tokyo Medical and Dental University Tokyo 113‐5810 Japan
3. Department of Periodontology School of Dentistry and Dental Research Institute Seoul National University and Seoul National University Dental Hospital Yeongeon‐dong, Jongno‐gu Seoul 03080 South Korea
4. Department of Oral and Craniomaxillofacial Surgery Center for Dental Medicine University Medical Center Freiburg 79110 Freiburg im Breisgau Germany
5. Department of Periodontics and Oral Medicine University of Michigan School of Dentistry Ann Arbor MI 48109 USA
6. Biointerfaces Institute University of Michigan Ann Arbor MI 48109 USA
7. Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 USA
8. Department of Periodontology Institute of Odontology University of Gothenburg Gothenburg 41390 Sweden