[1] UNIV CAMBRIDGE, SCH MED, DEPT RADIOTHERAPEUT, CAMBRIDGE, ENGLAND
[2] UNIV CAMBRIDGE, SCH MED, DEPT OBSTET & GYNAECOL, CAMBRIDGE, ENGLAND
[3] UNIV CAMBRIDGE, SCH MED, LUDWIG INST CANC RES, CAMBRIDGE, ENGLAND
[4] MRC, CLIN ONCOL UNIT, CAMBRIDGE CB2 2QH, ENGLAND