Affiliation: | 1. Departments of Obstetrics and Gynaecology and Haematology, King's College Hospital Medical School, London, S.E.5, U.K.;2. Departments of Obstetrics and Gynaecology and Haematology, King's College Hospital Medical School, London, S.E.5, U.K. Meir General Hospital, Kfar Saba, Israel. |