Affiliation: | 1. Department of Obstetrics and Gynaecology. University College Hospital, Huntley Street, London WCIE6AU, U.K.;2. Department of Chemical Pathology, Bernhard Baron Memorial Research Laboratories, Queen Charlotte's Maternity Hospital, Goldhawk Road, London W6 0XG, U.K.;3. Department of Obstetrics and Gynaecology, St James's University Hospital, leeds LS9 7TF, U.K. |