[1] Univ West Indies, Dept Clin Surg Sci, Anaesthesia & Intens Care Unit, St Augustine, Trinidad Tobago
[2] San Fernando Gen Hosp, Anaesthesia & Intens Care Unit, San Fernando, Trinidad Tobago
[3] Eric Williams Med Sci Complex, Anaesthesia & Intens Care Unit, Champ Fleurs, Trinidad Tobago