O-01: HYDROXYUREA REDUCES THE TRANSFUSION BURDEN IN CHILDREN WITH SICKLE CELL ANEMIA IN SUB-SAHARAN AFRICA: THE REACH EXPERIENCE - POWER-HAYS A., MD; TOMLINSON G., PHD, MSC; TSHILOLO L., MD, PHD; SANTOS B., MD; WILLIAMS T., MD, PHD; OLUPOT-OLUPOT P., MD, PHD; SMART L., MD; MCGANN P., MD, MS; STUBER S., MA; LATHAM T., MA; WARE R., MD, PHD (HemaSphere, 2022)