Affiliation: | 1. Department of Oral Health Sciences, Periodontology, KU Leuven & University of Leuven, Leuven, Belgium;2. Department of Periodontology, University Hospitals Leuven, Leuven, Belgium;3. Department of Clinical Biology, Scientific Institute of Public Health, Brussels, Belgium;4. Fund for Scientific Research Flanders (FWO), Egermontstraat, Brussels, Belgium |