1. Department of PeriodontologyJohann Wolfgang Goethe‐University Frankfurt Frankfurt Germany
2. Institute of Biostatistics and Clinical ResearchUniversity of Münster Münster Germany
3. Department of Restorative Dentistry, Periodontology, Endodontology, and Preventive and Pediatric DentistryUniversity Medicine Greifswald Greifswald Germany
4. Department of PeriodontologyTU Dresden Dresden Germany
5. Section of PeriodontologyDepartment of Conservative DentistryUniversity Hospital Heidelberg Heidelberg Germany
6. Department of PeriodontologyUniversity of Giessen Giessen Germany
7. Department of PeriodontologyDental SchoolFaculty of HealthUniversity of Witten/Herdecke Witten Germany
8. Departments of Periodontology and Synoptic DentistryCharité‐Universitätsmedizin Berlin Berlin Germany
9. Department of PeriodontologyUniversity Hospital Würzburg Würzburg Germany
10. Department of PeriodontologyUniversity Hospital Münster Münster Germany