TY - JOUR AU - Roach, RE; Lijfering, WM; Helmerhorst, FM TI - The risk of venous thrombosis in women over 50 years old using oral contraception or postmenopausal hormone therapy JO - J Thromb Haemost VL - 11 PY - 2013 DO - 10.1111/jth.12060 L3 - PubMed-ID: 23136837 L3 - PubMed-ID: 23136837 SP - 124 EP - 131 N1 - et al. ER -