[1] Hop Necker Enfants Malad, AP HP, Serv Pediat Gen, F-75015 Paris, France
[2] Univ Paris 05, Paris, France
[3] ULB, Hop Univ Enfants Reine Fabiola, Brussels, Belgium
[4] Univ Padua, Dept Pediat, Clin Pediat Hematol Oncol, Padua, Italy
[5] Kings Coll London, Kings Coll Hosp, Sch Med, Dept Paediat Haematol, London WC2R 2LS, England
[6] ULB, Hop Erasme, Dept Clin Chem, Brussels, Belgium