we report three members of a family who had reduced levels of plasma von willebrand factor ( vwf ) and increased ristocetin-induced platelet aggregation ( ripa ) ( aggregation of platelet-rich plasma with ristocetin at a concentration of 0.45 mg/ml ) , as previously reported in type iib and pseudo-von willebrand 's disease ( vwd ) .
C0042971
von
C0542153
increased