F2 and autoimmune hemolytic anemia: 4F-PCC: 4-factor prothrombin complex concentrate; AHA: acquired hemophilia A; aPCC: activated prothrombin complex concentrate; FFP: fresh frozen plasma FVIII: factor VIII; rFVIII: recombinant factor VIII; rFVIIa: recombinant factor VIIa; rpFVIII: recombinant porcine FVIII