The determination of functional plasminogen activator inhibitors (PAI) based on the inhibition of urokinase: PAI normal range and circadian variations in healthy donors; comparison with other methods - Alessi, M-C; Gaussem, P; Juhan-Vague, I; Aiach, M; Musitelli, J-J; Keuper, J H (Fibrinolysis, 1990)