[1] Univ Illinois, Div Hematol Oncol, Chicago, IL 60607 USA
[2] Howard Univ, Ctr Sickle Cell Dis, Washington, DC 20059 USA
[3] Howard Univ, Washington, DC 20059 USA
[4] Howard Univ, Ctr Sickle Cell, Washington, DC 20059 USA
[5] Howard Univ, Dept Human Genet, Washington, DC 20059 USA
[6] Univ Illinois, Dept Med, Ctr Comprehens Sickle Cell, Hematol Oncol Sect, Chicago, IL 60612 USA
[7] Howard Univ, Dept Microbiol, Washington, DC 20059 USA