1. Department of Surgical Dentistry Division of Periodontics University of Colorado Anschutz Medical Campus Aurora Colorado USA
2. William Harvey Research Institute Charterhouse Square Barts and the London School of Medicine and Dentistry, Queen Mary University of London London UK
3. Faculty of Dentistry, Oral & Craniofacial Sciences Guy's Hospital London UK
4. Department of Oral Health and Diagnostic Sciences Division of Periodontology Dental Clinical Research Center School of Dental Medicine University of Connecticut Health Farmington Connecticut USA