1. Pharmacology Section, Department of Basic Medical Sciences, University of the West Indies, Kingston, Jamaica.
2. Department of Basic Medical Sciences and Biotechnology Centre, University of the West Indies, Kingston, Jamaica.
3. Department of Life Sciences, Texas A&M University-Corpus Christi, Corpus Christi, Texas, USA.
4. Faculty of Medical Sciences, University of the West Indies, St. Augustine, Trinidad & Tobago.