Measurement of factor VIII activity of efraloctocog alfa with commercially available one‐stage clotting and chromogenic assays: Results from the Belgian national External Quality Assessment Scheme. (6th October 2018) - Van Blerk, Marjan; Chatelain, Bernard; Devreese, Katrien; Jacquemin, Marc; Jochmans, Kristin; Mullier, François; Soumali, Mohamed R.; Broeders, Sylvia