[1] ROYAL POSTGRAD MED SCH,DEPT HISTOPATHOL,CELL ADHES LAB,LONDON,ENGLAND
[2] ROYAL COLL SURGEONS ENGLAND,EPITHELIAL RES UNIT,LONDON WC2A 3PN,ENGLAND
[3] HAMMERSMITH HOSP,IMPERIAL CANC RES FUND,MOL ONCOL GRP,LONDON W12 0HS,ENGLAND
[4] ROYAL POSTGRAD MED SCH,DEPT SURG,LONDON,ENGLAND