1. G.E.R.N. Tissue Replacement, Regeneration & Neogenesis; Department of Operative Dentistry and Periodontology; Faculty of Medicine; Medical Center - University of Freiburg; Albert-Ludwigs-University of Freiburg; Freiburg Germany
2. Centre for Dental Medicine; Department of Operative Dentistry and Periodontology; Faculty of Medicine; Medical Center - University of Freiburg; Albert-Ludwigs-University of Freiburg; Freiburg Germany
3. Institute of Medical Biometry and Statistics; Faculty of Medicine; Medical Center - University of Freiburg; Albert-Ludwigs-University of Freiburg; Freiburg Germany
4. Clinic for Preventive Dentistry, Periodontology and Cariology; Center of Dental Medicine; University of Zurich; Zurich Switzerland