Direct Stimulation of Urokinase, Plasmin, and Collagenase by Meperidine: A Possible Mechanism for the Ability of Meperidine to Enhance Cervical Effacement and Dilation - Milwidsky, Ariel; Finci-Yeheskel, Zwezdana; Mayer, Michael (American Journal of Perinatology, 1993)