Valproic acid produces Von-Willebrand syndrome and prolongs bleeding time in epileptic adults: Study of 55 patients from one center - GilFernandez, JJ; Gomez, NG; Pinilla, I; Sarasqueta, I; Ramos, C; Sanchez, S; Pajuelo, JF; Lozoya, B; FernandezRanada, JM (THROMBOSIS AND HAEMOSTASIS, 1997)