R D T Farmer, T J Williams, E L Simpson, A L Nightingale
Farmer R D T, Williams T J, Simpson E L, Nightingale A L.
Effect of 1995 pill scare on rates of venous thromboembolism among women taking combined oral contraceptives: analysis of General Practice Research Database
BMJ 2000; 321 :477
doi:10.1136/bmj.321.7259.477