Metabolism of 2-oxo-clopidogrel to the clopidogrel active H4 metabolite using human liver microsomes and its inhibitory effect on ADP-induced human platelet aggregation ex vivo: a confirmatory, placebo-controlled, parallel-group study - Christian Schulz; Steffen Braune; Christof Mrowietz; Jan-Heiner Küpper; Friedrich Jung (Frontiers in Cardiovascular Medicine, 2026)