[1] UNIV OXFORD,JOHN RADCLIFFE HOSP,INST MOLEC MED,OXFORD OX3 9DU,ENGLAND
[2] UNITED MED & DENT SCH GUYS & ST THOMASS,DIV MED & MOLEC GENET,LONDON SE1 9RT,ENGLAND
[3] CHURCHILL HOSP,DNA LAB,OXFORD,ENGLAND
[4] UNIV OXFORD,JOHN RADCLIFFE HOSP,DEPT PAEDIAT,OXFORD OX3 9DU,ENGLAND