Maytté Marcano1, Alessandra Baasch2, José Luis Mejía1, Irene Tamí-Maury3. 1. Department of Oral Health, School of Dentistry, Universidad Autónoma de Manizales, Manizales, Department of Caldas, Colombia. 2. Graduate Program in Endodontics, School of Dentistry, Universidad Central de Venezuela, Caracas, Capital District, Venezuela. 3. Department of Behavioral Science, University of Texas MD Anderson Cancer Center, Houston, Texas, United States of America, itami@mdanderson.org.