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    Severe bleeding in two patients due to increased sensitivity of factor IX activity to phenprocoumon therapy

     Two male patients with severe and recurrent bleeding episodes under phenprocoumon therapy are reported. Both patients exhibited a strong decrease of their factor IX activities below 1% of normal, whereas the ...

    E.-M. Quenzel, H.-J. Hertfelder, J. Oldenburg in Annals of Hematology (1997)