1. Section for Periodontology; Microbiology and Community Dentistry; Department of Odontology; Faculty of Health Sciences; University of Copenhagen; Copenhagen Denmark
2. Section for Oral Medicine; Department of Odontology; Faculty of Health Sciences; University of Copenhagen; Copenhagen Denmark
3. Department of Medical Microbiology; Copenhagen University Hospital; Copenhagen Denmark
4. The Forsyth Institute; Cambridge MA United States
5. Department of Oral Medicine; Infection & Immunity; Harvard School of Dental Medicine; Boston MA United States