Racine Ramnath1, Maxine Gossell-Williams2. 1. Section of Pharmacology and Pharmacy, Faculty of Medical Sciences, University of the West Indies, Mona Campus, Kingston 7, Jamaica. 2. Section of Pharmacology and Pharmacy, Faculty of Medical Sciences, University of the West Indies, Mona Campus, Kingston 7, Jamaica. Maxine.gossell@uwimona.edu.jm.