Retrospective Cohort Study on the Risk of Venous Thromboembolism with the use of combined oral contraceptives containing Chlormadinone Acetate/Ethinylestradiol and Levonorgestrel/Ethinylestradiol (RIVET-RCS) First published 14/04/2016 Last updated 10/06/2024 EU PAS number:EUPAS12171 Study Finalised