1. Institute of Oral Microbiology and Preventive Dentistry, University of Basel Center of Dental Medicine, Switzerland;
2. Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, Swiss Federal Institute of Technology -ETH-, Zürich, Switzerland; and
3. Department of Preventive Dentistry, Periodontology, and Cariology, University of Zürich Center of Dental Medicine, Plattenstrasse 11, CH-8032 Zürich, Switzerland