1. Dental Practice De Liefde Amsterdam The Netherlands
2. ACTA—Academisch Centrum Tandheelkunde Amsterdam Afdeling voor Parodontologie Amsterdam The Netherlands
3. Goldschlager School of Dental Medicine, Department of Periodontology and Dental Implants Tel‐Aviv University Tel Aviv Israel
4. Center for Dentistry and Oral Medicine (Carolinum), Department of Periodontology Goethe‐University Frankfurt Frankfurt am Main Germany