1. Department of Epidemiology; University of North Carolina at Chapel Hill; Chapel Hill NC USA
2. Department of Dental Ecology; University of North Carolina at Chapel Hill; Chapel Hill NC USA
3. Department of Gastroenterology and Hepatology; University of North Carolina at Chapel Hill; Chapel Hill NC USA
4. Department of Periodontology; University of North Carolina at Chapel Hill; Chapel Hill NC USA
5. Institute of Clinical Chemistry and Laboratory Medicine; University Medicine Greifswald; Greifswald Germany
6. Unit of Periodontology; Department of Restorative Dentistry; Periodontology, Endodontology, and Preventive and Pediatric Dentistry; University Medicine Greifswald; Greifswald Germany
7. Department of Medicine A; University Medicine Greifswald; Greifswald Germany
8. Department of Medicine; Ludwig-Maximilians University; Munich Germany
9. Institute for Community Medicine; University Medicine Greifswald; Greifswald Germany