1 | University of the West Indies,Department of Life Sciences, St. Augustine Trinidad, West Indies |
2 | University of the West Indies, Caribbean Epidemiology Centre, Federation Park, Port of Spain, Trinidad |
3 | University of the West Indies, Department of Para Clinical Studies, Faculty of Medicine, Mt. Hope, Trinidad |
4 | University of Miami School of Medicine, Department of Epidemiology and Public Health, Miami, Florida, USA |