[1] Belfast City Hosp, Dept Haematol, Belfast BT9 7AD, Antrim, North Ireland
[2] Univ S Florida, Coll Med, Tampa, FL USA
[3] Childrens Hlth Care Atlanta, Atlanta, GA USA
[4] Univ London Imperial Coll Sci Technol & Med, Dept Haematol, London, England
[5] Queens Univ Belfast, Dept Haematol, Belfast, Antrim, North Ireland