[1] Kings Coll Hosp London, Dept Haematol Med, London, England
[2] Kings Coll London, Comprehens Canc Ctr, Sch Canc & Pharmaceut Sci, Red Cell Hematol Lab, London, England
[3] Univ Roma Tor Vergata, Dept Syst Med, Rome, Italy
[4] Copenhagen Univ Hosp Rigshospitalet, Ctr Haemoglobinopathies, Dept Haematol, Copenhagen, Denmark
[5] Univ Cambridge, Dept Vet Med, Cambridge, England