A 1-year randomized study to evaluate the effects of a dose reduction in oral contraceptives on lipids and carbohydrate metabolism: 20 μg ethinyl estradiol combined with 100 μg levonorgestrelSven O. Skouby; Jan Endrikat; Bernd Düsterberg; Werner Schmidt; Christoph Gerlinger; Jens Wessel; Henri Goldstein; Joergen Jespersen · 2005