[1] St Jude Childrens Res Hosp, Dept Global Pediat Med, Memphis, TN USA
[2] St Jude Childrens Res Hosp, Dept Hematol, Memphis, TN USA
[3] Vanderbilt Univ, Vanderbilt Meharry Matthew Walker Ctr Excellence S, Dept Pediat, Div Hematol & Oncol,Med Ctr, Nashville, TN USA
[4] Univ Alabama Birmingham, Dept Med, Div Hematol & Oncol, Birmingham, AL USA
[5] Bayero Univ, Ctr Infect Dis Res, Kano, Nigeria
[6] Bayero Univ Kano, Dept Sociol, Kano, Nigeria
[7] Bayero Univ Kano, Dept Math Sci, Kano, Nigeria
[8] Bayero Univ, Aminu Kano Teaching Hosp, Dept Pediat, Kano, Nigeria
[9] Bayero Univ, Aminu Kano Teaching Hosp, Dept Hematol, Kano, Nigeria
[10] Murtala Mohammed Specialist Hosp, Dept Pediat, Kano, Nigeria
[11] Univ Alabama Birmingham, Dept Med Hematol, Birmingham, AL 35294 USA