1. Department of Periodontology; Academic Centre for Dentistry Amsterdam (ACTA); University of Amsterdam and VU University Amsterdam; Amsterdam The Netherlands
2. Department of Oral Medicine; Faculty of Dentistry; Gadjah Mada University; Yogyakarta Indonesia
3. Center for Dentistry and Oral Hygiene; Department of Periodontology; University of Groningen and University Medical Center Groningen; Groningen The Netherlands
4. Department of Vascular Medicine; Academic Medical Center (AMC); University of Amsterdam; Amsterdam The Netherlands
5. Department of Internal Medicine; Slotervaart Hospital; Amsterdam The Netherlands
6. Periodontology Unit; Department of Clinical Research; UCL Eastman Dental Institute; London UK