A randomized placebo-controlled study of the effect of low dose aspirin on platelet reactivity and serum thromboxane B2 production in non pregnant women, in normal pregnancy, and in gestational hypertension - Louden, KA; Broughton, Pipkin F; Symonds, EM; Tuohy, P; O’Callaghan, C; Heptinstall, S; Fox, S; Mitchell, JRA (Br J Obst Gynaecol, 1992)