TY - STAND
AU - Y. Vinogradova
AU - C. Coupland
AU - J. Hippisley-Cox
BT - BMJ Open
DO - 10.1136/bmjopen-2013-004499
M1 - 4
PY - 2014
EP - e004499
T2 - BMJ Open
TI - Exposure to combined oral contraceptives and risk of venous thromboembolism: a protocol for nested case-control studies using the QResearch and the CPRD databases
VL - 4
SN - 2044-6055 (Print) 2044-6055
ER -