[1] Lagos State Univ, Coll Med, Dept Haematol & Blood Transfus, Ikeja, Nigeria
[2] Lagos State Univ, Teaching Hosp, Dept Haematol & Blood Transfus, Ikeja, Nigeria
[3] Univ Lagos, Dept Haematol & Blood Transfus, Fac Clin Sci, Coll Med, Idiaraba, Nigeria
[4] Lagos State Univ, Dept Med, Coll Med, Ikeja, Nigeria
[5] Harvard Univ, TH Chan Sch Publ Hlth, Dept Global Hlth & Populat, Boston, MA 02115 USA