TY - STAND
AU - Y. Vinogradova
AU - C. Coupland
AU - J. Hippisley-Cox
BT - Bmj
DO - 10.1136/bmj.h2135
PY - 2015
EP - h2135
T2 - Bmj
TI - Use of combined oral contraceptives and risk of venous thromboembolism: nested case-control studies using the QResearch and CPRD databases
VL - 350
SN - 0959-8138
ER -