“…This disease has been subclassified in three subtypes: A , representing 80–90% of total cases (or 1 : 5000 births), where females are carriers, males are only affected, and male-to-male transmission does not occur; B (Christmas disease), which is much less common (1 : 30,000 births); and C (Rosenthal syndrome), also very rare [ 3 , 8 ]. Additionally, a fourth type of hemophilia was proposed by the Norwegian physician Owren in 1947 [ 9 ], the Owren's disease or parahemophilia , caused by a deficient factor V, with an incidence of 1 case per 1 million children [ 1 , 10 ]. A and B types are clinically indistinguishable [ 3 ] and are caused by deficiencies of the coagulation mechanism factors VIII (or antihemophilic factor) and IX (or plasma thromboplastin component), respectively; C subtype results from a deficiency of factor XI [ 2 , 8 ].…”