1. Department of Para-Clinical SciencesFaculty of Medicine, University of the West Indies, St. Augustine, Trinidad, West Indies
2. North West Regional Health AuthoritySt. George Central, Barataria, Trinidad
3. Department of Life SciencesUniversity of the West Indies, St. Augustine, Trinidad, West Indies
4. Department of Global HealthSchool of Public Health, University of Washington, Seattle, WA, USA