1. Department of Odontology, Section for Clinical Oral Microbiology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
2. Department of Odontology, Section for Oral Biology and Immunopathology, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
3. Institute for Inflammation Research, Center for Rheumatology and Spine Diseases, Rigshospitalet, Copenhagen, Denmark
4. Department of Periodontology, Institute of Dentistry, University of Turku, Turku, Finland
5. Department of Oral Biochemistry, Academic Center for Dentistry Amsterdam, University of Amsterdam and Vrije Universiteit, Amsterdam, Netherlands