Venskutonis, T. 2016. Periapical tissue evaluation: analysis of existing indexes and application of Periapical and Endodontic Status Scale (PESS) in clinical practice. Giornale Italiano di Endodonzia. 30, 1 (Jun. 2016), 14–21. DOI:https://doi.org/10.32067/gie.2016.30.01.04.