P830: CROVALIMAB MAINTAINS CLINICAL BENEFIT OVER LONG-TERM TREATMENT IN PATIENTS WITH PAROXYSMAL NOCTURNAL HEMOGLOBINURIA: RESULTS FROM THE COMPOSER TRIAL OPEN-LABEL EXTENSION by 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, S.-S. Yoon, K. Benkali, M. Buri, P. Lundberg, H. Patel, K. Shinomiya, S. Sreckovic, J.-I. Nishimura

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