Relationship between Endogenous, Transgene FVIII Expression and Bleeding Events Following Valoctocogene Roxaparvovec Gene Transfer for Severe Hemophilia A: A Post-Hoc Analysis of the GENEr8-1 Phase 3 Trial - Pipe, Steven W; Ozelo, Margareth C; Kenet, Gili; Reding, Mark T; Mason, Jane; Leavitt, Andrew D; Madan, Bella; Laffan, Michael; Quon, Doris V.; von Drygalski, Annette; Chou, Sheng-Chieh; Shapiro, Susan; et al. (Blood, 2021)