1. Department of Surgical, Medical and Molecular Pathology and Critical Care Medicine; University of Pisa; Pisa Italy
2. Department of Oral Surgery and Stomatology; School of Dental Medicine; University of Bern; Bern Switzerland
3. ETEP (Etiology and Therapy of Periodontal Diseases) Research Group; Complutense University; Madrid Spain
4. Department of Periodontics; Melbourne Dental School; University of Melbourne; Melbourne Vic. Australia
5. Department of Periodontology; School of Dental Medicine; University of Bern; Bern Switzerland