Long-term Efficacy and Safety of Fitusiran in Participants with Hemophilia A and B: An Interim Analysis of the Phase 1/2 Open-Label Extension Study - Négrier, C; Ragni, MV; Pasi, KJ; Pipe, SW; Hegemann, I; Chowdary, P; Lissitchkov, T; Georgiev, P; Qiu, Z; Poloskey, S; Kichou, S; Mei, B; Andersson, S; Sussebach, C (Hämostaseologie, 2021)