Investigation of the hemostatic effect of a transdermal patch containing 0.55 mg ethinyl estradiol and 2.1 mg gestodene compared with a monophasic oral contraceptive containing 0.03 mg ethinyl estradiol and 0.15 mg levonorgestrel: an open-label, randomized, crossover study. - Junge W; Heger-Mahn D; Trummer D; Merz M (Drugs in R&D, 2013)