1. Pan American Health Organization, Washington, D.C., United States of America.
2. rosendeand@paho.org
3. University of South Carolina, Columbia, United States of America.
4. Southern California Permanente Medical Group, Los Angeles, United States of America.
5. Pan American Health Organization, Buenos Aires, Argentina.
6. University of Antofagasta, Antofagasta, Chile.
7. University of the West Indies, St. Michael, Barbados.