1. Patrick R Schmidlin, Dr med dent, senior research associate, Department of Preventive Denstistry, Periodontology and Cariology, Dental Institute, University of Zurich, Zurich, Switzerland
2. Till N Göhring, PD Dr med dent, senior research associate, Department of Preventive Denstistry, Periodontology and Cariology, Dental Institute, University of Zurich, Zurich, Switzerland
3. Malgorzata Roos, PhD, research associate, Department of Biostatistics, ISPM, University of Zurich, Zurich, Switzerland
4. Matthias Zehnder, Dr med dent, PhD, senior research associate, Department of Preventive Denstistry, Periodontology and Cariology, Dental Institute, University of Zurich, Zurich, Switzerland