1. Institute of Medical Informatics and Statistics; Christian-Albrechts-University Kiel; Kiel Germany
2. Department of Periodontology, Operative and Preventive Dentistry; Rheinische-Friedrichs-Wilhelm-University; Bonn Germany
3. Department of Operative Dentistry and Periodontology; Campus Kiel; University Medical Center Schleswig-Holstein; Kiel Germany
4. Department of Periodontology; Clinic of Preventive Dentistry and Periodontology; University Medical Center of the Julius-Maximilians-University; Würzburg Germany
5. Center of Periodontology, Operative and Preventive Dentistry; University Medical Center Münster; Münster Germany
6. Department of Conservative Dentistry, Periodontology and Preventive Dentistry; Hannover Medical School; Hannover Germany
7. Department of Periodontology; University Medical Center Giessen and Marburg; Giessen Germany
8. Department of Periodontology; Centre for Dental, Oral, and Maxillofacial Medicine (Carolinum); Johann Wolfgang Goethe-University; Frankfurt am Main Germany
9. University Medical Center Carl Gustav Carus der Technischen Universität Dresden; Center of Periodontology, Operative and Preventive Dentistry; Clinic of Preventive Dentistry; Dresden Germany
10. Department of Conservative Dentistry and Periodontology; Bernhard Gottlieb University Clinic of Dentistry; Vienna Austria
11. Institute of Genetic Epidemiology; Helmholtz Zentrum München; German Research Center for Environmental Health; Neuherberg Germany
12. Institute of Epidemiology and Biobank popgen; University Medical Center Schleswig-Holstein; Kiel Germany
13. Institute for Clinical Molecular Biology; Christian-Albrechts-University Kiel; Kiel Germany
14. Institute for Medical Biometry and Statistics; University of Lübeck; University Hospital Schleswig-Holstein; Lübeck Germany