1. Department of Endodontics, Universidad Católica de Córdoba, Córdoba 5000, Argentina
2. Faculty of Dentistry, Universidad Nacional de Córdoba, Córdoba 5000, Argentina
3. Private Practice, Montevideo 11000, Uruguay
4. Department of Endodontics, University of Texas Health Science Center at San Antonio, San Antonio, TX 78229, USA
5. Dental School, Universidad de los Andes, Santiago de Chile 7550000, Chile