1. Department of Periodontology Johann Wolfgang Goethe‐University Frankfurt Frankfurt Germany
2. Institute of Biostatistics and Clinical Research University of Münster Münster Germany
3. Department of Periodontology University Hospital Münster Münster Germany
4. Department of Periodontology TU Dresden Dresden Germany
5. Section of Periodontology Department of Conservative Dentistry University Hospital Heidelberg Heidelberg Germany
6. Unit of Periodontology University Medicine Greifswald Greifswald Germany
7. Department of Periodontology University of Giessen Giessen Germany
8. Department of Periodontology Witten/Herdecke University Witten Germany
9. Department of Periodontology and Synoptic Dentistry Charité Centrum 3 Charité‐Universitäsmedizin Berlin Berlin Germany
10. Department of Periodontology University Hospital Würzburg Würzburg Germany
11. Department of Psychoanalysis and Psychotherapy Medical University of Vienna Vienna Austria