H Fletcher1, J Dawkins2, M Allison-Vaughan3. 1. Department of Obstetrics and Gynaecology, The University of the West Indies, Kingston 7, Jamaica. horace.fletcher@uwimona.edu.jm. 2. Department of Obstetrics and Gynaecology, The University of the West Indies, Kingston 7, Jamaica. 3. Apex X-ray and Ultrasound, 2A Molynes Road, Kingston, Jamaica.