Covello, F., Franco , V., Schiavetti , R., Clementini , M., Mannocci , A., Ottria , L. and Costacurta, M. 2010. Prevalence of apical periodontitis and quality of endodontic treatment in an Italian adult population. Oral & Implantology. 3, 4 (Dec. 2010), 9–14.