1. Department of Periodontics and Oral Medicine, Department of Biomedical Engineering, and the Biointerfaces Institute, University of Michigan, Ann Arbor, MI, USA
2. Department of Oral Biology, Faculty of Dentistry, University of Manitoba, Winnipeg, Canada
3. McGill University, Montreal, Quebec, Canada
4. University of Minnesota, Minneapolis, MN, USA
5. School of Dentistry, University of Birmingham, Birmingham, UK