[1] UNIV HOSP WALES, WELSH NATL SCH MED, DEPT CHILD HLTH, CARDIFF CF4 4XN, S GLAMORGAN, WALES
[2] UNIV WALES, WELSH NATL SCH MED, DEPT HAEMATOL, CARDIFF CF4 4XN, S GLAMORGAN, WALES
[3] UNIV WALES, UNIV COLL CARDIFF, DEPT BIOCHEM, CARDIFF CF1 1XL, S GLAMORGAN, WALES