[1] Univ West Indies, Fac Med Sci, Dept Clin Surg Sci, Obstet & Gynaecol Unit, St Augustine, Trinidad Tobago
[2] Diagnost Mother & Baby, Private Sect, Chaguanas, Trinidad Tobago
[3] Minist Hlth, Directorate Womens Hlth, Port of Spain, Trinidad Tobago
[4] San Fernando Gen Hosp, Dept Obstet & Gynaecol, South West Reg Hlth Author, San Fernando, Trinidad Tobago
[5] Univ West Indies, Fac Med Sci, Dept Clin Surg Sci, Obstet & Gynaecol Unit, 81 Chin Chin Rd, St Augustine, Trinidad Tobago