[1] ST MARYS GEN HOSP,DEPT RADIOTHERAPY & ONCOL,PORTSMOUTH PO3 6AD,ENGLAND
[2] UNIV COLL HOSP LONDON,SCH MED,MRC,STAT RES & SERV UNIT,LONDON WC1E 6AS,ENGLAND
[3] MT VERNON HOSP,MARIE CURIE RES WING ONCOL,NORTHWOOD HA6 2RN,MIDDLESEX,ENGLAND
[4] CHURCHILL HOSP,RES INST,OXFORD OX3 7LJ,ENGLAND