1. Endodontics Section; Department of Stomatology; School of Dentistry; University of Sevilla; Sevilla Spain
2. Endodontics Section; Department of Stomatology; School of Dentistry; University of Zaragoza; Zaragoza Spain
3. Comprehensive Dentistry; Department of Stomatology; School of Dentistry; University of Sevilla; Sevilla Spain