1. Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, 17012-901 Bauru SP, Brazil
2. Clinic for Preventive Dentistry, Periodontology and Cariology, University of Zurich, 8032 Zurich, Switzerland
3. Department of Cariology and Gerodontology, Faculty of Dentistry, University of Oslo, 0455 Oslo, Norway
4. Department of Conservative and Preventive Dentistry, Dental Clinic, Justus Liebig University, 35392 Giessen, Germany