1. University of the West Indies, Kingston, Jamaica
2. tracybabydoc@gmail.com
3. Pan American Health Organization, Paramaribo, Suriname.
4. Pan American Health Organization, (Retired Immunization Advisor, Bridgetown, Barbados).
5. University of Geneva, Geneva, Switzerland.
6. Pan American Health Organization, Caracas, Venezuela.
7. University of the West Indies, Cave Hill, Barbados.