Factor VH-deficient substrate plasmas depleted of protein C raise the sensitivity of the factor VII bio-assay to activated factor VII: an international study - Miller, G J; Stirling, Y; Esnouf, M P; Heinrich, J; van, de Loo; Kienast, J; Wu, K K; Morrissey, J H; Meade, T W; Martin, J C; Imeson, J D; Cooper, J A; Finch, A (Thromb Haemost, 1994)