1. Periodontal Research Group, School of Dentistry, College of Medical and Dental Science, University of Birmingham, Edgbaston, Birmingham, UK
2. Department of Restorative Dentistry, Periodontology, Endodontology, and Preventive and Paediatric Dentistry, University Medicine Greifswald, Greifswald, Germany
3. German Centre for Cardiovascular Research (DZHK), Partner Site Greifswald, Greifswald, Germany
4. Department of Study of Health in Pomerania/Clinical-Epidemiological Research, Institute for Community Medicine, University Medicine Greifswald, Greifswald, Germany
5. Institute for Laboratory Medicine and Clinical Chemistry, University Medicine Greifswald, Greifswald, Germany
6. Centre for Statistics in Medicine, University of Oxford, Oxford UK
7. Department of Health Sciences, University of Leicester, University Road, Leicester, UK