to determine if the amount or type of factor viii preparation alters the risk of acquiring immune defects , three groups of asymptomatic heterosexual men were studied : 34 with severe classic hemophilia who were receiving lyophilized factor viii concentrate , 10 with either mild classic hemophilia or moderately severe von willebrand 's disease who were receiving cryoprecipitate and 22 normal men who served as controls .
C0015506
factor viii
C0042974
von