[1] ROY FREE HOSP, DEPT CHEM PATHOL, LONDON, ENGLAND
[2] E HAM MEM HOSP, DEPT PATHOL, LONDON, ENGLAND
[3] COVENTRY & WARWICKSHIRE HOSP, DEPT PATHOL, COVENTRY, ENGLAND
[4] LONDON HOSP, DEPT MED PHYS, LONDON, ENGLAND
[5] ROY POSTGRAD MED SCH, DEPT HAEMATOL, LONDON, ENGLAND
[6] UNIV LEEDS, GEN INFIRM, DEPT CHEM PATHOL, LEEDS LS1 3EX, ENGLAND