To evaluate the impact of a @-day extended regimen combined oral contraceptive ( @ g levonorgestrel -LSB- LNG -RSB- / @ g ethinylestradiol -LSB- EE -RSB- for @ days , followed by @ g EE for seven days -LSB- Treatment @ -RSB- ) compared with two traditional @/@ regimens ( @ days @ g LNG/@ g EE -LSB- Treatment @ -RSB- or @ g desogestrel -LSB- DSG -RSB- / @ g EE -LSB- Treatment @ -RSB- , both with seven days ' hormone free ) , on several coagulation factors and thrombin formation markers .