[1] Univ Coll Hosp, Dept Histopathol, London, England
[2] Osped Bellaria, Sect Anatom Pathol M Malpighi, Bologna, Italy
[3] Addenbrookes Hosp, Dept Histopathol, Cambridge CB2 2QQ, England
[4] UCH, Dept Obstet & Gynaecol, Human Genet & Embryol Grp, London, England
[5] Ludwig Inst Canc Res, London, England
[6] Ctr Appl Med Stat, Cambridge, England