1. Department of Periodontology Julius‐Maximilians University Würzburg Würzburg Germany
2. Private practice Fürth Germany
3. Department of Oral Surgery School of Dentistry University of Birmingham Birmingham UK
4. Birmingham Community Healthcare NHS Trust Birmingham UK
5. Periodontal Research Group Institute of Clinical Sciences College of Medical & Dental Sciences The University of Birmingham Birmingham UK
6. Division of Periodontics, Section of Oral, Diagnostic and Rehabilitation Sciences Columbia University College of Dental Medicine New York USA