1. Clinic of Conservative & Preventive Dentistry, Division of Periodontology & Peri‐implant Diseases, Center of Dental Medicine University of Zurich Zurich Switzerland
2. Department of Oral and Maxillofacial Surgery, Centre for Dental Medicine University of Freiburg Freiburg Germany
3. Faculty of Mathematics, Informatics and Statistics, Department of Statistics Ludwig‐Maximilians‐University Munich Munich Germany
4. Department for Periodontology, Faculty of Health Witten/Herdecke University Witten Germany