[1] INST CHILD HLTH,MOLEC GENET UNIT,30 GUILFORD ST,LONDON WC1N 1EH,ENGLAND
[2] INST CHILD HLTH,MOLEC IMMUNOL UNIT,LONDON WC1N 1EH,ENGLAND
[3] BIRMINGHAM MATERN HOSP,DEPT CLIN GENET,BIRMINGHAM B15 2TG,W MIDLANDS,ENGLAND
[4] ST JAMES HOSP,DEPT IMMUNOL,DUBLIN 8,IRELAND
[5] UNIV BRESCIA,DEPT PAEDIAT,I-25123 BRESCIA,ITALY
[6] LEIDEN UNIV HOSP,DEPT IMMUNOHAEMATOL,2333 AA LEIDEN,NETHERLANDS
[7] ST MARYS HOSP,DEPT MED GENET,MANCHESTER M13 0JH,LANCS,ENGLAND