Tettamanti , L.; Gaudio , R. M.; Cura , F.; Mucchi , D.; Illuzzi , N.; Tagliabue , A. PREVALENCE OF PERIODONTAL PATHOGENS AMONG ITALIAN PATIENTS WITH CHRONIC PERIODONTITIS: A RETROSPECTIVE STUDY ON 2992 PATIENTS. Oral Implantol 2017, 10, 28-36.