1. Unit of Periodontology; Department of Restorative Dentistry, Periodontology, and Endodontology; University Medicine; Ernst Moritz Arndt University of Greifswald; Greifswald; Germany
2. Department of SHIP/Clinical-Epidemiological Research; Institute for Community Medicine; University Medicine; Ernst Moritz Arndt University of Greifswald; Greifswald; Germany
3. Department of Prosthodontics, Gerodontology, and Biomaterials; University Medicine; Ernst Moritz Arndt University of Greifswald; Greifswald; Germany