1. Clinic of Operative Dentistry, Periodontology and Preventive Dentistry, Saarland University, Homburg, Germany
2. Leibniz Institute for Surface Modification, Leipzig, Germany
3. Vascular Biology Group, Fraunhofer Institute, Leipzig, Germany
4. Institute for Medical Biometry, Epidemiology and Medical Informatics, Saarland University, Homburg, Germany