title: Congenital factor VII deficiency--safety of surgery without preoperative transfusion.
mesh_terms: D001803:Blood Transfusion; D005168:Factor VII Deficiency / Q000150:complications / Q000151:congenital*; D006801:Humans; D008297:Male; D008551:Melena / Q000209:etiology; D008875:Middle Aged; D010437:Peptic Ulcer / Q000601:surgery*; D012449:Safety