1. Periodontal Research Group, School of Dentistry, Institute of Clinical Sciences, University of Birmingham, and Birmingham Dental Hospital (Birmingham Community Healthcare NHS Foundation Trust), Edgbaston, Birmingham, UK
2. Dental Public Health and Health Services Research Group, School of Dentistry, University of Leeds, Leeds, UK
3. Rheumatology Research Group, Institute of Inflammation and Ageing, College of Medical & Dental Sciences, University of Birmingham, Birmingham, UK
4. Department of Rheumatology, Sandwell and West Birmingham Hospital NHS Trust, Birmingham, UK