Hormone withdrawal-associated symptoms with ethinylestradiol 20 μg/drospirenone 3 mg (24/4 regimen) versus ethinylestradiol 20 μg/desogestrel 150 μg (21/7 regimen). - Bitzer J; Banal-Silao MJ; Ahrendt HJ; Restrepo J; Hardtke M; Wissinger-Graefenhahn U; Trummer D (International journal of women's health, 2015)