1 Pan American Health Organization Bogota Colombia Pan American Health Organization, Bogota, Colombia.
2 Special Programme for Research and Training in Tropical Diseases-World Health Organization Geneva Switzerland Special Programme for Research and Training in Tropical Diseases-World Health Organization, Geneva, Switzerland.
3 Pan American Health Organization Washington, DC United States of America Pan American Health Organization, Washington, DC, United States of America.
4 Federal University of Health Sciences of Porto Alegre Porto Alegre Brazil Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil.