P1477: CHARACTERIZING SICKLE CELL DISEASE AND BURDEN OF ILLNESS IN THE UNITED STATES OF AMERICA: A RETROSPECTIVE ANALYSIS OF REAL-WORLD DATA. (23rd June 2022) - Clay, E. L. J.; Paulose, J.; Rowe, C.; Tierney, M.; Zhou, Y.; Pattipaka, T.; Wormser, D.; Fermont, J. M.