Øjvind Lidegaard, Ellen Løkkegaard, Anne Louise Svendsen, Carsten Agger
Lidegaard /span>, Løkkegaard E, Svendsen A L, Agger C.
Hormonal contraception and risk of venous thromboembolism: national follow-up study
BMJ 2009; 339 :b2890
doi:10.1136/bmj.b2890