Pharmacokinetic parameters of recombinant factor IX Fc fusion protein are not influenced by factor IX antigen levels in subjects from the Phase 3 B‐LONG trial - Sidonio, Robert F.; Casiano, Sandra; Falk, Aletta; Altincatal, Arman; Katragadda, Suresh; Santagostino, Elena; Windyga, Jerzy (Haemophilia : the official journal of the World Federation of Hemophilia, 2023)