1. Department of Oral Microbiology and Immunology; Institute of Odontology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
2. Department of Dental Medicine and Academic Centre of Gerodontics; Karolinska Institute; Huddinge Sweden
3. Department of Cariology; Institute of Odontology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden