1. Department of Operative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo-USP, Bauru, Brazil
2. Faculty of Dentistry of the Catholic University of Cuenca-Azogues, Ecuador
3. Department of Endodontics, School of Dentistry, Cayetano Heredia Peruvian University, Lima, Peru
4. Department of Endodontics, School of Dentistry, Central University of Venezuela, Caracas, Venezuela