[1] Duke Univ, Sch Nursing, Sch Med, Durham, NC USA
[2] St Jude Childrens Res Hosp, Dept Hematol, Memphis, TN USA
[3] Augusta Univ, Med Coll Georgia, Augusta, GA USA
[4] Univ Illinois, Sickle Cell Ctr, Dept Med, Div Hematol & Oncol, Carol Stream, IL USA
[5] Univ Illinois, Dept Med, Chicago, IL USA
[6] Med Univ South Carolina, Charleston, SC 29425 USA
[7] RTI Int, Durham, NC USA
[8] Duke Univ, Emergency Med, Durham, NC USA
[9] Mt Sinai Sch Med, New York, NY USA
[10] Childrens Hosp & Res Ctr, Oakland, CA USA
[11] Washington Univ, Sch Med, St Louis, MO USA