P830: CROVALIMAB MAINTAINS CLINICAL BENEFIT OVER LONG-TERM TREATMENT IN PATIENTS WITH PAROXYSMAL NOCTURNAL HEMOGLOBINURIA: RESULTS FROM THE COMPOSER TRIAL OPEN-LABEL EXTENSION - A. Röth; M. Egyed; S. Ichikawa; Y. Ito; J. S. Kim; Z. Nagy; N. Obara; J. Panse; H. Schrezenmeier; S. Sica; J. Soret; K. Usuki; et al. (HemaSphere, 2022)