1. Department of Preventive Dentistry, Academic Centre for Dentistry Amsterdam (ACTA), University of Amsterdam and VU University Amsterdam, Gustav Mahlerlaan 3004, 1081 LA Amsterdam, The Netherlands
2. Department of Microbial Diseases, UCL Eastman Dental Institute, 256 Gray's Inn Road, London WC1X 8LD, UK
3. Department of Drug Sciences, University of Pavia, Via Taramelli 12, 27100 Pavia, Italy
4. Microbiology Section, Department of Pathology and Diagnostics, University of Verona, Strada Le Grazie 8, 37134 Verona, Italy
5. DIPTERIS, University of Genoa, Corso Europa 26, 16132 Genoa, Italy
6. Department of Cariology, Institute of Odontology at Sahlgrenska Academy, University of Gothenburg, P.O. Box 450, 405 30 Göteborg, Sweden