1. The University of Texas MD Anderson Cancer Center, Houston, United States of America.
2. mslopez1@mdanderson.org
3. US National Cancer Institute, Bethesda, United States of America.
4. Pan American Health Organization (PAHO), Washington, DC, United States of America.
5. Baylor College of Medicine, Houston, United States of America.
6. Consejo Nacional de Investigaciones Científicas y Técnicas, Centro de Estudios de Estado y Sociedad, Buenos Aires, Argentina.