1Periodontics, Eastman Institute for Oral Health, University of Rochester, Rochester, NY, USA
2School of Dentistry, University of California San Francisco, San Francisco, CA, USA
3Department of Periodontology, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
4Periodontal Research Group, Institute of Clinical Sciences, College of Medical & Dental Sciences, University of Birmingham, Birmingham, UK
5Department of Periodontology, Operative and Preventive Dentistry, University of Bonn, Bonn, Germany
6University of Michigan School of Dentistry, Ann Arbor, MI, USA
7University of Texas Health Science Center, San Antonio, TX USA
8Columbia University College of Dental Medicine, New York, NY, USA
9Facultad de Odontologia, Universidad Complutense Madrid, Madrid, Spain
10Periodontology, Faculty of Dentistry, University of Hong Kong, Hong Kong, SAR China