1. Department of Periodontics, School of Dentistry, University of Washington, Seattle, WA, USA
2. Department of Preventive Dentistry, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
3. Centre for Immunology and Infectious Disease, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK
4. Department of Oral Health Sciences, School of Dentistry, University of Washington, Seattle, WA, USA