Vijay Kumar Chattu1, Sateesh Sakhamuri2. 1. Department of Paraclinical Sciences, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago. Electronic address: vijay.chattu@sta.uwi.edu. 2. Department of Clinical Medical Sciences, Faculty of Medical Sciences, The University of the West Indies, St. Augustine, Trinidad and Tobago.