1. Department of Cariology; Institute of Odontology; The Sahlgrenska Academy at the University of Gothenburg; Gothenburg Sweden
2. Public Dental Health Service Västra Götaland; University Clinics; Gothenburg Sweden
3. Department of Oral Microbiology and Immunology; Institute of Odontology; The Sahlgrenska Academy at the University of Gothenburg; Gothenburg Sweden