%0 Journal Article %A Per Morten Sandset %T Combined oral contraceptives increase risk of venous thrombosis according to oestrogen dose and type of progestogen %D 2014 %R 10.1136/ebmed-2014-110011 %J Evidence Based Medicine %P 194-194 %V 19 %N 5 %U https://ebm.bmj.com/content/ebmed/19/5/194.full.pdf