1. Periodontology Unit, Centre for Host Microbiome Interactions, Faculty of Dentistry, Oral & Craniofacial Sciences, King’s College London, London WC2R 2LS, UK
2. Centre for Immunobiology & Regenerative Medicine and Centre for Oral Clinical Research, Institute of Dentistry, Faculty of Medicine and Dentistry, Queen Mary University of London (QMUL), London E1 4NS, UK
3. Department of Clinical and Experimental Medicine, Garibaldi-Nesima Hospital, University of Catania, 95123 Catania, Italy
4. Department of Clinical and Experimental Medicine, Cannizzaro Hospital, University of Catania, 95123 Catania, Italy
5. Academic Unit of Internal Medicine, Cannizzaro Hospital, Via Messina 829, 95126 Catania, Italy