TY - STAND
AU - L. Parkin
AU - K. Sharples
AU - R. Hernandez
AU - S. Jick
BT - Bmj
DO - 10.1136/bmj.d2139
PY - 2011
EP - d2139
T2 - Bmj
TI - Risk of venous thromboembolism in users of oral contraceptives containing drospirenone or levonorgestrel: nested case-control study based on UK General Practice Research Database
VL - 342
SN - 0959-8138
ER -